BUILD­ING A REVO­LU­TION

.308 WIN. POWER IN AN AR-15 PACK­AGE

Gun World - - Contents - By Todd Bur­green

POF-USA’s rev­o­lu­tion­ary new Revo­lu­tion ri­fle gives full­sized .308 Win. power in a stan­dard AR-15-sized pack­age.

It is no se­cret that Eu­gene Stoner’s AR plat­form is the best-sell­ing ri­fle in the United States, with nu­mer­ous man­u­fac­tur­ers jump­ing on the band­wagon in re­cent years.

In gen­eral terms, ARs come in two sizes—AR-15 and AR-10. The AR-15 is most as­so­ci­ated with 5.56mm/.223 Remington and the AR-10 with 7.62 NATO/.308 Winch­ester. Many would char­ac­ter­ize the AR-10 as an AR-15 on steroids be­cause of its larger size, larger cal­iber and heav­ier weight. It is taken for granted the AR-10 will be of greater size due to the need to ac­com­mo­date the larger .308 Win. Car­tridge.

Chal­leng­ing this as­sump­tion is the pur­pose of this ar­ti­cle.

The AR-10 ac­tu­ally pre­dates the AR-15. Eu­gene Stoner first in­tro­duced the AR-10 in 1956 in a hasty ef­fort to com­pete against the M14 in the U.S. Army weapon tri­als. Stoner

de­signed the AR-10 around di­rect-im­pinge­ment gas op­er­a­tion com­bined with in­no­va­tive straight-line bar­rel/stock de­sign us­ing com­pos­ite and forged al­loy parts. In 1957, the ba­sic AR-10 de­sign was scaled down and sub­stan­tially mod­i­fied by Ar­maLite to ac­com­mo­date the .223 Remington car­tridge and was given the des­ig­na­tion, AR-15. The rest is his­tory.

With­out a doubt, the Pa­triot Ord­nance Fac­tory (POF-USA) Revo­lu­tion AR ri­fle will change users’ thoughts about how a 7.62 NATO/.308 Win. AR ri­fle can be con­fig­ured.

While we will fo­cus specif­i­cally on the POF-USA Revo­lu­tion for this ar­ti­cle, POF of­fers nu­mer­ous mod­els—di­rect im­pinge­ment and pis­ton driven—as well as mul­ti­ple cal­iber cham­ber­ings. From the be­gin­ning, POF charted its own path in en­hanc­ing the AR plat­form with in­no­va­tive fea­tures.

What sep­a­rates the POF Revo­lu­tion from other .308 Win. AR-10s? Of­ten, the AR-10 is as­so­ci­ated with an un­wieldy pro­file weigh­ing sub­stan­tially more than 9 pounds. POF-USA has made a con­scious ef­fort with the Revo­lu­tion to har­ness .308 Win. power within an AR-15 frame, thus of­fer­ing the user su­pe­rior ter­mi­nal bal­lis­tics while main­tain­ing svelte han­dling. The Revo­lu­tion is not merely a re­duced-scale AR-10 ri­fle: it uses the same­length bolt car­rier assem­bly, hand­guard, bar­rel ex­ten­sion, charg­ing han­dle, up­per/lower re­ceiver, etc. as the AR-15 while be­ing cham­bered in .308 Win.

CHAL­LENGE THE NORM

POF fea­tures that have cre­ated a cult-like fol­low­ing are present on the Revo­lu­tion, along with some new ones; for ex­am­ple, fully am­bidex­trous bil­let re­ceivers, a high phos­phate nickel-coated bolt car­rier group, five-po­si­tion ad­justable gas pis­ton and a sin­gle-stage match-grade trig­ger. The POF Revo­lu­tion mea­sures 34 inches with the Mis­sion First Tac­ti­cal stock col­lapsed and weighs 7.3 pounds.

The Revo­lu­tion ri­fle tested for this ar­ti­cle fea­tures a Burnt Bronze fin­ish (black and NP3 are also op­tions). It fea­tures a 16.5-inch, 1:10 twist, fluted chrome-al­loy bar­rel that is ni­tride heat-treated for full cor­ro­sion re­sis­tance. A POFde­signed triple port muz­zle brake aids in re­coil man­age­ment and flash sup­pres­sion.

Mag­pul PMAG LR/SR 7.62 mag­a­zines are in­cluded with the POF Revo­lu­tion. In my opin­ion, this is a huge plus. Mag­pul’s PMAG LR mag­a­zine is quickly be­com­ing the stan­dard .308 Win. AR mag­a­zine. A qual­ity mag­a­zine is a linch­pin for a re­li­ably func­tion­ing semi­au­to­matic or se­lect-fire weapon.

POF-USA will never be ac­cused of be­ing stag­nant or rest­ing on the de­signs of oth­ers. It was quite the en­gi­neer­ing feat to at­tain the im­pres­sive weight/frame di­men­sions of the over­all ri­fle, but in ad­di­tion to that, POF-USA has a num­ber of pa­tented im­prove­ments it in­cor­po­rates into its ri­fles.

First, POF’s pa­tented E2 dual-ex­trac­tion method con­sists of four small channels cut into the walls of the cham­ber, al­low­ing a small amount of gas pres­sure to push against the neck of the spent case. This pres­sure as­sists in ex­trac­tion by break­ing the seal be­tween the cham­ber and case, as well as push­ing the spent case to the rear as the ex­trac­tor is pulling to the rear. This re­moves a tremen­dous amount of work that would oth­er­wise be left up to the ex­trac­tor.

Next, the POF-pa­tented, over­sized, 3-inch-long heat sink bar­rel nut is an­other sig­nif­i­cant improve­ment. The POF bar­rel nut is much more ef­fi­cient at heat dis­si­pa­tion than the stan­dard AR bar­rel ar­range­ment. Ad­di­tional ben­e­fits are that the op­er­at­ing rod is bet­ter sup­ported to the bolt car­rier; and it strength­ens the up­per re­ceiver—es­pe­cially when an ac­ces­sory or ver­ti­cal fore­grip is mounted to the forend.

The POF-USA bolt car­rier is one-piece, high phos­phate nickel coated, with the me­chan­i­cal key built into the body and po­si­tioned be­hind the cam pin. This pa­tented de­sign helps re­duce car­rier tilt. The bolt, ex­trac­tor and fir­ing pin are all chrome plated. Both fin­ishes are cor­ro­sion re­sis­tant and in­tro­duce lu­bri­cious char­ac­ter­is­tics into the ac­tion.

In­no­va­tion does not stop here. The pa­tented roller cam pin was cre­ated to re­duce fric­tion and drag in the ac­tion. Stan­dard AR cam pins have square steel heads that can lit­er­ally grind and carve away at the in­side of the re­ceiver. POF-USA’s NP3-coated roller head ac­tu­ally rolls in­side the chan­nel of the up­per, thus elim­i­nat­ing fric­tion and pro­long­ing the life of the up­per re­ceiver.

POF calls its Mod­u­lar Railed Re­ceiver (MRR) its “crown jewel for pre­ci­sion and ex­treme rigid­ity.” This is a two-piece up­per assem­bly with a free-float­ing mono­lithic hand­guard that slides on and in­ter­faces di­rectly to the up­per assem­bly—not the bar­rel in­ter­face—us­ing POF’s re­in­forced “back­bone.” This keeps all the weight of the grip and ac­ces­sories off the bar­rel for a true and se­cure free-floated bar­rel. The hand­guard has more than six points of at­tach­ment to make sure the rail doesn’t move, even un­der the most rig­or­ous use. The forend is full M-Lok com­pat­i­ble with top and bot­tom sec­tions of the rail at the front, for sights and a bipod, or other ac­ces­sories. Four QD sling mount slots round out the forend.

The POF-USA Revo­lu­tion ri­fle uti­lizes a self-reg­u­lat­ing, short­stroke gas pis­ton op­er­at­ing sys­tem, en­sur­ing re­li­a­bil­ity in the harsh­est of con­di­tions. The prin­ci­pal improve­ment comes from elim­i­nat­ing the vent­ing of hot, car­bon-laden gasses into the re­ceiver and bolt car­rier group. This re­duces the clean­ing re­quire­ments as­so­ci­ated with di­rect-gas-im­pinge­ment ARs. It also means the bolt car­rier group and as­so­ci­ated springs are not sub­jected to the sear­ing heat of the trapped gasses—this be­ing one of the ma­jor causes of small parts fail­ure. The POF five-po­si­tion gas set­ting fur­ther en­sures a user can ad­just to fine-tune per­for­mance with dif­fer­ent am­mu­ni­tion and with chang­ing en­vi­ron­men­tal con­di­tions, not to men­tion bet­ter em­ploy a sup­pres­sor if mis­sion/use dic­tates this.

The fi­nal touches that set up the POF Revo­lu­tion for suc­cess are the triple-port muz­zle brake and POF drop-in trig­ger. The POF muz­zle de­vice is ni­tride heat-treated to con­trol gas dis­per­sion and re­duce muz­zle rise, al­low­ing the shooter to have faster fol­low-up shots and dampen felt re­coil.

A nice touch that helps set both aes­thetic and mar­tial tone are the blunt strike prongs on the end of the brake. The trig­ger is a sin­gle-stage, non-ad­justable, 4.5-pound-pull-weight, dropin trig­ger. KNS Pre­ci­sion Anti-walk pins are used to se­cure the trig­ger into the lower re­ceiver.

RUN­NING AND GUN­NING

My guid­ing thought for the POF Revo­lu­tion eval­u­a­tion was to treat it sim­i­larly to an AR-15 in terms of set­ting up sce­nar­ios that put it to the test to eval­u­ate its han­dling and abil­ity to send mul­ti­ple rounds down­range quickly and ef­fec­tively. Work­ing in and around ve­hi­cles pro­vides this type of re­al­is­tic feed­back.

In an ef­fort to max­i­mize the POF Revo­lu­tion’s po­ten­tial in terms of ac­cu­racy and flex­i­bil­ity, a Tri­ji­con AccuPower 1-8x28mm

WITH­OUT A DOUBT, THE PA­TRIOT ORD­NANCE

FAC­TORY (POF-USA) REVO­LU­TION AR RI­FLE WILL CHANGE USERS’ THOUGHTS ABOUT HOW A 7.62 NATO/.308 WIN. AR RI­FLE CAN BE CON­FIG­URED.

The Tri­ji­con AccuPower 1-8x28mm 34mm tube op­tic was mounted on the POF-USA Revo­lu­tion’s railed up­per re­ceiver. The 1-8x power range of­fered by the AccuPower solves any co­nun­drum posed by other, more­lim­ited op­tic magnification op­tions.

The bar­rel ex­ten­sion is the same di­am­e­ter as the M16 bar­rel ex­ten­sion. Only the feed ramps are changed to han­dle the large, .308/7.62x51mm car­tridge. 34mm tube op­tic was mounted on the railed up­per re­ceiver. The 1-8x power range of­fered by the AccuPower solves any co­nun­drum posed by other, more-lim­ited op­tic magnification op­tions. I have come to rely upon the Tri­ji­con 1-8x for many of my re­cent ri­fle re­views, thanks to its magnification range. This al­lows for close-range train­ing evo­lu­tions with a 1x il­lu­mi­nated ret­i­cle, as well as en­gag­ing tar­gets with greater pre­ci­sion at dis­tance, be­cause of the 8x.

Ini­tial ac­cu­racy test­ing in­volved a Tri­ji­con AccuPower 4.5-30x56mm op­tic and a Cham­pion pedestal rest and bags, com­bined with premium .308 Win. am­mu­ni­tion in the form of Fed­eral 168-grain Match, SIG Sauer 168-grain Match, Winch­ester 168-grain Match, Black Hills 168-grain Match and Hor­nady TAP 168-grain. FMJ Winch­ester (147 grain) was used for high round-count drills. The Revo­lu­tion pro­duced MOA groups with the Fed­eral 168-grain and only slightly larger with the SIG Sauer, Hor­nady and Black Hills.

While the Revo­lu­tion was more than ca­pa­ble of con­nect­ing with var­i­ous steel tar­gets ar­rayed along Echo Val­ley Train­ing Cen­ter’s (EVTC) stepped berm out to 330 yards, work­ing with it in­side its 360 range and Hesco Shoot House would be the true mea­sure of whether the Revo­lu­tion de­liv­ered on its prom­ise of a dif­fer­ent sort of .308 Win. AR.

Drills started out with work­ing around sim­u­lated cover while en­gag­ing des­ig­nated tar­gets in and around EVTC’s

ve­hi­cles to al­low eval­u­a­tors to get a “feel.” Sce­nar­ios were then set up to force mag­a­zine changes, as well as mov­ing to var­i­ous fir­ing points.

Even­tu­ally, the POF Revo­lu­tion was moved to within ve­hi­cle con­fines, where eval­u­a­tors fired on tar­gets from the range ve­hi­cles, as well as quickly ex­it­ing the car while main­tain­ing rounds sent down­range (steel tar­gets are struck with awe­some author­ity when 150-plus grains smack into them, es­pe­cially from close range. It is easy to tell the dif­fer­ence be­tween 5.56mm and .308 Win. im­pacts at any dis­tance).

BE­WARE OF THE MAN WITH ONLY ONE RI­FLE

For a ri­fle to be con­sid­ered truly ver­sa­tile, it must be able to sat­isfy mul­ti­ple roles with equal aplomb. A def­i­nite can­di­date for this ti­tle is the POF-USA Revo­lu­tion cham­bered in .308 Win. Bal­lis­tic and ter­mi­nal ef­fect po­tency makes the .308 Win. a fa­vorite among our troops and law en­force­ment per­son­nel in more-ru­ral en­vi­ron­ments. A look at the res­ur­rec­tion of the

THE REVO­LU­TION IS NOT MERELY A REDUCEDSCALE AR-10 RI­FLE: IT USES THE SAME-LENGTH BOLT CAR­RIER ASSEM­BLY, HAND­GUARD, BAR­REL EX­TEN­SION, CHARG­ING HAN­DLE, UP­PER/LOWER RE­CEIVER, ETC. AS THE AR-15 WHILE BE­ING CHAM­BERED IN .308 WIN.

M-14 and most AR man­u­fac­tur­ers main­tain­ing an AR-10 in their model line­ups sup­port this ob­ser­va­tion.

In many users’ minds, the added weight of most AR-10 plat­forms com­pared to the smaller AR-15 negates in­her­ent AR qual­i­ties of han­dling. The com­bi­na­tion of the great-han­dling AR-15 plat­form with the in­creased power rep­re­sented in the .308 Win. car­tridge is the key to the Revo­lu­tion’s al­lure. This is in re­la­tion to the Revo­lu­tion’s lethal­ity and ef­fec­tive range, while still al­low­ing for mul­ti­ple rounds sent quickly down­range if needed, in a closerange mêlée. In train­ing cour­ses in­volv­ing law en­force­ment, mil­i­tary and pri­vate se­cu­rity con­trac­tors, the mantra of “one mag, one kill” is of­ten re­peated when re­fer­ring to the M16/AR-15. While the 5.56mm round is of­ten chided re­gard­ing lethal­ity, the .308 Win. does not suf­fer from this rep­u­ta­tion. POF-USA HAS

MADE A CON­SCIOUS EF­FORT WITH THE REVO­LU­TION TO HAR­NESS .308 WIN. POWER WITHIN AN AR-15 FRAME, THUS OF­FER­ING THE USER SU­PE­RIOR TER­MI­NAL BAL­LIS­TICS WHILE MAIN­TAIN­ING SVELTE HAN­DLING.

The Revo­lu­tion’s stan­dard-length AR-15 charg­ing han­dle and bolt group. POF-USA pro­vides a one­piece, high phos­phate nickel-coated bolt car­rier with the me­chan­i­cal key built into the body and po­si­tioned be­hind the “roller” cam pin.

Years of ex­pe­ri­ence and dozens of train­ing cour­ses have given me strong opin­ions about what con­sti­tutes an ef­fec­tive fight­ing ri­fle. To me, that means a re­turn to AR ba­sics, such as great-han­dling ri­fles with po­tent fire­power. The POF Revo­lu­tion’s abil­ity to main­tain a func­tional weight of 7.3 pounds while fea­tur­ing .308 fire­power is hard to deny as a po­ten­tial can­di­date for “all-around” per­former.

The Revo­lu­tion proved re­li­able through­out this eval­u­a­tion. Ap­prox­i­mately 550 rounds were fired, many of them rapidly, with­out clean­ing the ri­fle dur­ing mul­ti­ple range vis­its. When con­sid­er­ing han­dling and ma­neu­ver­ing, the Revo­lu­tion is su­pe­rior to other AR-10 ri­fles I have tested.

The Revo­lu­tion equally cov­ers the gamut of likely sit­u­a­tions en­coun­tered by law en­force­ment or se­cu­rity-con­scious civil­ians. This re­flects the POF’s de­sign and use of the .308 Win. cham­ber­ing. POF-USA’s thought process was to create a light­weight, sim­ple-to-op­er­ate AR ri­fle sim­i­lar to Eu­gene Stoner’s orig­i­nal con­cept while ac­cess­ing the .308’s power.

The Revo­lu­tion is not merely a re­duced-scale AR-10 ri­fle: it uses the same-length bolt car­rier assem­bly, hand­guard, bar­rel ex­ten­sion, charg­ing han­dle, up­per/lower re­ceiver, etc. as the AR-15 while be­ing cham­bered in .308 Win. GW

There is a plethora of AR-10-style ri­fles vy­ing for con­sumer at­ten­tion, whether they are in­di­vid­u­als,depart­ments or other en­ti­ties. The POF-USA Revo­lu­tion is wor­thy of con­sid­er­a­tion based on in­no­va­tive de­sign, at­ten­tion to de­tail and the qual­ity of ma­te­ri­als used in its man­u­fac­ture.

The POF-USA Revo­lu­tion could be the an­swer to ful­fill­ing a mul­ti­tude of roles—pre­ci­sion ri­fle, gen­eral-pur­pose pa­trol ri­fle or en­try weapon. This is a pos­i­tive re­flec­tion on the ri­fle’s ac­cu­racy, re­li­a­bil­ity, han­dling and er­gonomics.

POF’s triple-port muz­zle brake is ni­tride heat-treated— de­signed to con­trol gas dis­per­sion and re­duce muz­zle rise. Note that the ad­justable gas valve is eas­ily ac­cessed in front of the forend rail.

The Revo­lu­tion fea­tures fully am­bidex­trous bil­let lower and up­per re­ceivers.The POF Mod­u­lar Railed Re­ceiver(MRR) sys­tem is a two-piece up­per assem­bly with a freefloat­ing, mono­lithic hand­guard that slides on and in­ter­faces di­rectly to the up­per assem­bly—thanks to the POF-re­in­forced “back­bone.”

The POF’s trig­ger is a sin­gle-stage, non-ad­justable, drop-in trig­ger with a 4.5-pound pull weight.

Drills in­volv­ing the tight con­fines as­so­ci­ated with work­ing around ve­hi­cles were used to eval­u­ate the POF Revo­lu­tion.I

There is no doubt­ing .308 Win. punch. Many con­sider a .308 Win. AR, such as the Revo­lu­tion, the per­fect bal­ance of fire­power ef­fec­tive­ness.

POF-USA’s pa­tented E2 dual-ex­trac­tion method con­sists of four small channels cut into the walls of the cham­ber that al­low a small amount of gas pres­sure to push against the neck of the spent case. Note the lines formed into the case necks in the photo.

POF-USA Revo­lu­tion’s in­nate ac­cu­racy re­sults shown. These groups were fired from the bench us­ing a Cham­pion front pedestal and rear bag and with a Tri­ji­con 4.5-30x scope mounted.I

The Revo­lu­tion bolt car­rier group (left) next to a “nor­mal,” full-sized AR-10 POF bolt car­rier (Photo: POF-USA)

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