Neil Price takes on a complex top quality target rifle
Part two of Neil’s refurbishment of a Feinwerkbau Model 300S
29 I carefully removed the piston ring from the groove, taking care not to break it. I have never known one of these to have to be replaced because of wear. I carefully cleaned up the outside and two edges of the piston ring using 1000 grit wet and dry paper. I scraped the deposits out of the piston ring groove with a small screwdriver.
30 Everything is nicely cleaned up and the piston ring is now free within its groove.
31 Everything is here that is required to overhaul this rifle, a pair of springs with opposing helix angles, a joining bush, a piston buffer and a breech seal. The piston buffers do age harden and break up and do irreparable damage to the end of the compression cylinder.
The kit was obtained from: City Air Weapons And Firearms 247 Lyndon Road Olton Solihull West Midlands B92 7QP United Kingdom 012174213239
32 The new springs were slightly longer than the originals, but well worth replacing whilst the gun is stripped down.
33 The breech seal at the end of the compression cylinder looks like it has seen better days.
34 The old breech seal is picked out with a small screwdriver and the new seal pressed in by hand.
35 I put a slight smear of lube on the inner rim of the new buffer to aid assembly. I then placed the piston upright on a firm surface and tapped the latch rod smartly with a soft faced mallet to seat the new buffer into the recess in the end of the piston.
36 I put just a smear of Feinwerkbau special assembly grease all around the piston ring and at the back of the piston and slid the piston into the compression cylinder. The piston ring has to be pinched shut with your fingers to facilitate entry into the cylinder. Make sure that the cocking slot in the piston is lined up with the slot in the compression cylinder.
37 Insert the compression cylinder and piston assembly into the action, lining the breech seal up with breech cone.
38 Check that all of the cocking slots are still in line.
39 The lightest smear of the assembly grease on the ends and outside of the new springs, and then they can be fitted inside the piston.
40 Make sure that the piston locking plate and the filler piece are correctly located in the slot in the end of the trigger block.
41 Insert the trigger block into the end of the action.
42 Hold the action upright and exert downward pressure to compress the springs and fully engage the trigger block into the action. Start the shoulder screw, complete with washers and saddle by hand. Careful with this because it is easy to crossthread. Fully tighten the shoulder screw.
43 Replace the safety spring plunder into the forward hole. With my sausage- like fingers, I find a pair of needle- nosed pliers does the trick.
44 Insert the safety spring. Again, I find that needle- nosed pliers are a great help.
45 Make sure that the spring is properly located in the recess in the trigger block and that the hole in the spring is located over the spigot on the safety plunger.
46 Insert the spring clamp pin through the hole in the end of the spring and the rear hole in the action.
47 Refit the ‘C’ clip. I find squeezing them on with needle- nosed pliers is the easiest method.
48 More of the assembly grease on the hook of the cocking arm, and the hook is located in the slot in the compression chamber.
49 The cocking lever assembly is replaced with some assembly grease on the fulcrum pin and the pin tightened.
50 That’s better. I can feel the breech seal compressing from when the cocking lever is in this position.
51 Offer up the trigger assembly so that the two screw holes are in line, and then with a small screwdriver align the cocking ratchet drive tang with the slot in the compression cylinder.
52 With the tang aligned, insert and tighten the two slot- head retaining screws.
53 Clean up the angle bracket and assemble into the end of the guide bar housing, locating the two lugs on the bracket into the corresponding holes in the guide bar.
54 Slide the guide bar over the trigger assembly and locate the rear axle pin in its bore. Make sure that the two dimples on the rear axle bracket are correctly located in the two holes in the guide bar.
55 Insert the axle pins through the holes in the frame and the guide bar housing.
56 Secure the axle pins with the ‘C’ clips.
57 Reattach the guide bar spring.
58 Insert the guide bar securing pin. Secure the guide bar cross pin with the ‘C’ clip.
The only things left to do now are to attach the action to the stock with the two cross head screws, and refit the dioptre sight.
- Neil will be taking a look a the Feinwerkbrau P70 rifle.
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