Top Value Guns

Tim Fin­ley en­joys putting the Sig Sauer MPX through its paces

Airgun World - - Contents -

The month’s top value gun al­ready has a moun­tain of fans and prob­a­bly does not need the ex­tra public­ity of my hum­ble re­view, but I’d still like to share my thoughts on the re­doubtable Sig Sauer MPX. It caused a mas­sive stir when it was launched, as did its big­ger brother, the MCX.

The MPX is a heavy gun, and it feels hefty in the hands at 3kg, mak­ing it only 0.3kg heav­ier than the real 9mm MPX, which weighs in at 2.7kg, and the over­all length is ex­actly the same at 654mm.

It is CO2-pow­ered, and uses the big­gest CO2 power-plant that you can get into a gun – the mas­sive 88-gram screw-in bulb. Although the in­struc­tion book states that it uses a 90-gram bulb. On the MPX the big bulb fits nicely in the butt stock, just as if it was de­signed for a 88/90 gram bulb, even as a firearm. The syn­thetic butt is held on the ac­tion by a push-in, spring-loaded but­ton on the right-hand side of the butt tube, and at the end of the re­mov­able butt is a rub­ber butt pad with the Sig Sauer logo SIG.


The big­gest is­sue with a multi-shot CO2 gun that wants to shoot lead pel­lets and have a re­mov­able mag­a­zine, is how you feed the pel­lets into the bar­rel, so Sig Sauer clev­erly came up with a belt-fed sys­tem within the re­mov­able mag­a­zine. Both the MCX and MPX use the RPM sys­tem – RPM stands of course for ‘Rapid Pel­let Mag­a­zine’ – and I’ve al­ways been scep­ti­cal when it comes to pel­let mag­a­zines like these. In the past, such things have been great ideas, but not so much in prac­tice – not so the RPM, which uses a 30-sec­tion chain of al­loy and syn­thetic links that travel around in the mag­a­zine. The chain has to be taken out in or­der to load it up, but in the owner’s man­ual there is a page of clear in­struc­tions on how to do this, start­ing with how to re­move it with­out dam­ag­ing the in­ter­nals.

The trap door on the right-hand side of the

mag­a­zine opens so that the bot­tom part of the chain can be taken out, and it has to be taken out clock­wise as shown in the il­lus­tra­tions. The pel­lets can then be loaded into the chain, and of course, there is a right way and a wrong way. The main thing is to en­sure that they are pressed quite firmly into the syn­thetic tubes so that they don’t fall out. Run­ning around the chain is a raised block, and this runs in a key way in­side the mag­a­zine, which in­serts just like the real one, and the mag­a­zine re­lease catch is on the right-hand side, above the trig­ger guard.


To cock the ri­fle, you pull back on the cock­ing slide. Again, just like the real thing, the slide is pulled back by hook­ing two fingers, sim­ple. The safety catch is right above the trig­ger – am­bidex­trous, of course, as is the grip. Chrono­graph test­ing was a long job, es­pe­cially with one mag­a­zine, but in the end it gave me five 30-shot mag­a­zines’ worth of use­able shots – that’s 150 pel­lets down­range.

The power out­put ranged from1.5 to 3.9 ft. lbs. and as this is a short-range plink­ing gun, this is per­fectly ac­cept­able. Also, with the length of 200mm ri­fled steel bar­rel, it has to be set to sub 6ft.lbs. to stay within the UK gun laws, and the MCX has the longer bar­rel so you can pos­si­bly con­vert into a pre-charged power-plant. You can get an adap­tor to use 12 gram CO2 bulbs if you just want a quick plink­ing ses­sion, and don’t want to leave the ex­pen­sive 88 gram bulb in the gun, or waste money by re­mov­ing it for stor­age.

The han­dling of the MPX is su­perb, ei­ther left- or right-handed, and the build qual­ity is very good – they are made in Ja­pan. It comes fit­ted with an open-sight sys­tem, which folds down to en­able a red-dot sight to be fit­ted if re­quired. In fact, they sell the MPX with a Sig Sauer 20R red-dot sight as a pack­age. I fit­ted the red-dot sight and found it to be top qual­ity. The height of the mount is such that the flip-up sights in­dex to the red dot, and this makes them back-up sights; should the red dot fail, the open sights can be flipped up and away you go. The front is a sim­ple post, but this can be ad­justed up and down by a clever spring-loaded plunger lock­ing sys­tem, an­other nod to the real MPX. The rear sight has two flip-up diop­tre el­e­ments, a small and large aper­ture, and is ad­justable for windage. It proved very ac­cu­rate at 6 yards with all shots fall­ing within 20mm. Yes, it’s ex­pen­sive for a low-pow­ered plinker, but it truly is worth the money – and then some. I

The Sig MPX is an all-ac­tion plinker with all sorts of ap­peal­ing fea­tures.

It’s a Sig, Tim, but not as we know it.

The chain pel­let hold­ing sys­tem.

The safety catch fire to safe on the left-hand side; note the red dot.

The 88 gram, CO2 bulb is housed in the re­mov­able butt stock.

Clos­ing up the mag­a­zine.

The cock­ing han­dle.

The pel­lets in the chain sys­tem.

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