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So where are we now that we’ve made these mods? The same 7.4 grain pellets now hit an average of 645 fps, a gain of 62 fps and 1.25 fpe. All the pump and valve o-rings were changed before reassembly. I did some tweaks to the trigger and striker that I’ll address in a future post. To eliminate this, I wrapped copper wire around the rubber bumper, forcing it deeper, locking the metal piston head in the foremost position. Instead, I noticed that the metal head of the piston was able to move forward and backward. The finished inlet check optimized for maximum pressureĪt this point in my project, I haven’t addressed the dimples in the piston head. This still allows air into the valve, but takes up almost all the dead space, leading to much higher pressures. To do so, I drilled a 7/64″ hole into the inlet check and superglued a piece of hex wrench in it. The next thing I addressed was that massive inlet hole in the valve. I also removed some of the excess material, increasing valve volume and decreasing spring tension. The first thing I did was remove the check seal, chuck the check guide into my drill and grind down the face until it was smooth. The piston features 2 dimples, the valve inlet is a whopping 7/64″ hole 1/4″ deep, and the inlet check has a deep phillips screw pattern leading to terrible pump efficiency. Time to tear it down again and fix everything they did to keep kids from overpumping the rifle to valve lock. It averaged a measly 583 fps with 7.4 grain pellets at 10 pumps. I reassembled the rifle and chronographed it. Luckily, the leak was caused by a bit of fuzz sticking to the intake check seal. Ready to slay some Special ops squirrels! This got me to tear down the rifle and see if I couldn’t fix it myself since my communication has been slow with them. They finally emailed me back a couple days ago. I bought it primarily to develop a LDC for it, but went ahead and attempted to contact Bear River regarding the leak. Right out of the box, it had a intake check leak. The only accepted payment method at $5,000 or more is wire transfer.I picked up a refurbished Bear River Sportsman 900 back in July. Payment: Wire Transfer for Total Sale Amounts of $5,000 or more IF YOUR BID IS APPROVED, YOUR PAYMENT METHOD ON FILE WILL BE CHARGED AUTOMATICALLY. By placing your bid, you agree to 's Terms & ConditionsĪnd Bidding & Buying Policy. If your bid does not meet the Reserve Price, THIS SELLER MAY STILL BE WILLING TO ACCEPT THE FINAL TOP BID at the end of the auction. To learm more, please read the Terms of Sale. In addition, all payments must be made using a wire transfer.
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