Beeman P17 Pistol Project

I’m not one to make a huge todo about my own birthdays, but when I saw a Beeman P17 for sale at a local store, my birthday was all the excuse I needed to justify another airgun purchase. It has been about 2.5 years since I bought one of these, and I was kind of surprised to see it lubricated with something that reminded me of cosmoline. I cleaned up all the nasty lubrication, replaced the pison o-ring, and lightly lubed it with some air tool oil. At this point, it was shooting 7.4 grain wadcutters at 410 fps, just as the package said it would.

I’ve decided to leave this one as a pistol, but I wanted a longer barrel for a little added speed. My original 880 has gotten worn out from being taken apart and stressed to the limit, so I decided to take its barrel and use it for my new P17. I cut it to 10″, polished the barrel and ends, recrowned and added a leade to the barrel. Six applications of cold blue were made, finishing a beautiful barrel.

Barrel stays in place with 220 grit wet/dry sandpaper

Barrel retention was a problem that had an easy solution – 220 grit sandpaper applied with grit facing barrel. The stock clamp is then applied, locking the barrel in tight for good accuracy and a tight seal. Here’s how I secured the barrel toward the muzzle end:

Note the silicone tubing

A .25″ length of 3/16″ x 5/16″ silicone tubing was stretched over the barrel and pressed into the end of the “slide”. It provides a tight fit and keeps everything centered. From the above picture, you can see the custom 65mm long LDC that I built to make this even quieter for indoor target practice. The P17 has quite a pop even with the longer barrel and this LDC turns it into a mouse fart.

Silent but deadly

With the trigger adjustment screw backed out a bit, it has a nice long first stage, hits a wall, and the second stage breaks almost like glass. Combined with a new muzzle velocity of 450 fps with 7.4 grain pellets and 400 fps with 10 grain pellets, this is a accurate, quiet shooter, perfect for target practice or hunting very small pests.

The beautiful thing about this build is that the P17 can be cocked without the need to backdraft or make major modifications to the frame. It can be done with a very limited supply of tools and an assortment of sandpaper and steel wool. If you have any questions on this build or would like to purchase a LDC for your P17, head over to my contact page and I’ll be happy to answer your questions or build you a LDC.

Waking up the Bear River Sportsman 900

In my last post about the Bear River Sportsman 900, I fixed a intake leak, reduced headspace, and ended up with a rifle that shot on par with a stock Daisy Powerline 880. Kind of disappointing, since I really like the handling characteristics and accuracy of the Sportsman 900. I’m not one to give up, so the story continues here.

I tore down the Sportsman 900 once more, determined to squeeze out the power potential that I know is there. As I mentioned previously, the mods I had done opened up some valve volume. To take up some volume, I took a 3/8″ length of some 3/16″ round stock and placed it inside the spring. This gives enough room for the valve to open and reduces volume allowing pressure to build quicker:

Stuffed the part of the valve inside the spring

I reassembled and got no more velocity than before. There’s foolery at play and I’m going to get to the heart of it. As mentioned in my previous post, I hadn’t done anything with the two dimples in the pump head. This time, the pump head was removed from the piston, chucked in a power drill, and ground down against a belt sander. Once the dimples were gone, I polished the face with a piece of fine sandpaper against some glass.

This further reduces headspace, but not enough to account for the lack of power. I then turned my attention to the rubber bumper between the piston and pump head. It is a very soft material, and I suspect it is giving me grief. In its place, I inserted a nut that was ground down just enough to provide tension against the pump head pin:

There will be minimal play with this setup

I went ahead and replaced all o rings before I put it together once more. Ten pumps were put in and a 7.4 grain wadcutter loaded. This time, I got what I was after!

8.71 FPE with 10 pumps and light pellets

I gained nearly 85 fps and 2 FPE over my previous mods using the same pellet. The shot to shot velocity is very consistent. I haven’t tested heavier pellets yet, but I suspect they’ll produce even more energy than these light ones do. We are now looking at reliable squirrel and rabbit hunting energy.

There are many other things I’d like to do with these rifles. I just might have to pick up another refurb or two!

1322 ACP Carbine Saga Continues

I’ve finally gotten in the parts I was needing to continue working on my 1322 ACP (air conserving pumper). One of those parts was a flat top valve and piston set from Airgunsmith. I highly recommend this setup, as the parts are well machined and thought out. The primary reason I chose this setup was for the felt oiler. Multistroke pneumatic airguns need to maintain a film of oil for consistent powerful results.

I also added a Crosman steel breech. I had to rethread the bolt handle, but aside from that, they make a killer breech for the money. It adds a nice heft to the carbine and gives a rock solid scope mount as well. There was a good deal of bolt flip with each shot, so for now, I’ve added a disc magnet below the bolt handle to correct that. This helped to tighten the extreme spread.

1377 ACP Carbine

Once all the new pieces were installed, performance went up a good deal. With 11 pumps for the initial fill and 8 pumps between shots, it was averaging 505 fps with CPHPs. Accuracy is great when the LDC is properly adjusted and the right pellet for the barrel is selected:

Looks like I need to stock up on RWS Superpoints

H&N Sniper Lights and RWS Superpoints are nearly neck and neck in performance, easily capable of shooting dime sized groups at 20 yards. Since I am building this for hunting at sub 25 yard ranges, I just placed an order for 1750 of the Superpoints to keep the carbine well fed.

I wasn’t satisfied with the performance, as I’d like to be able to hunt squirrels with this rig. To improve performance, I turned my attention to tuning my free flight hammer. The spring guide and everything attached to it is accelerated with the hammer. The more massive this setup is, the more energy it robs from the hammer. I installed a nylock wingnut for the external stop, cut off the wings, and ground it as close to the nylon as I dared. All excess parts of the spring guide were ground down. Here’s the end result:

Lean, mean spring guide

Performance has gone up dramatically. It is now tuned for an initial fill of 15 pumps, with 9 recharge pumps between shots. Average muzzle velocity with H&N Sniper Lights is now 553 fps and muzzle energy is 9.5 FPE. This is good enough for my intended purposes. Combining a quick sip of high pressure air with the LDC makes this carbine super quiet.

An even lighter spring guide combined with a 18″ barrel will probably get me over the 600 fps mark. I’m hoping to achieve that with no more than 10 recharge pumps. I’ll continue to document my progress as time allows.