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I built an upper with an 18" Wilson Combat Recon barrel with rifle gas system for a friend (he wanted get his first AR for hunting, I sold him on the Grendel). This is my 3rd Grendel and 5th AR build. He was excited on how it looked and balanced for him. When I built the upper I used the same steps as before. Measure the gas port from the shoulder, measure the offset on the gas block. I ordered the gas block, tube and barrel all from Wilson. Figure that was the best bet for a proper fit. I used a pencil to mark the barrel and gas block with a reference line. The barrel is also dimpled from the factory. The dimple and all of my marks lined up.
We take it to the range for the first time and it will shoot any where from 4 to 15 rounds before having a jam. All cases are being ejected. I swapped lowers and BCG from a known good rifle. I put the new lower and BCG on a 16" group buy barrel, mid gas system. The lower and BCG worked mine with the 16" upper, used fully loaded elander mags, 1-10 and 2-17 with no problems. The known good lower and BCG had the same jams as the new lower. It took me a 5 or 6 jams before I realized what was happening. Both lowers are using a standard carbine buffer. Which is what Wilson recommends. We were using 123 gr Hornady AG factory ammo.
I told him I would take a look at it and get it corrected before giving it back. I started disassembling the upper to confirm the gas port size, gas block alignment and anything else I can find. When I attempted to pull the gas block and tube from the upper, the tube will not come out of the upper. It's stuck at the very end of the tube still in the upper. I'm still newer to ARs but I've never seen this before.
Since I can't complete the disassembly I'm just going to clean and lube everything and give it another shot at the range tomorrow with both Grendels and an additional lower running an A5 buffer. I plan on calling or emailing Wilson on Monday. I feel bad that I sold me friend on the Grendel and on the fact building is better than buying so you can get exactly what you want. I'm open for any suggestions?
We take it to the range for the first time and it will shoot any where from 4 to 15 rounds before having a jam. All cases are being ejected. I swapped lowers and BCG from a known good rifle. I put the new lower and BCG on a 16" group buy barrel, mid gas system. The lower and BCG worked mine with the 16" upper, used fully loaded elander mags, 1-10 and 2-17 with no problems. The known good lower and BCG had the same jams as the new lower. It took me a 5 or 6 jams before I realized what was happening. Both lowers are using a standard carbine buffer. Which is what Wilson recommends. We were using 123 gr Hornady AG factory ammo.
I told him I would take a look at it and get it corrected before giving it back. I started disassembling the upper to confirm the gas port size, gas block alignment and anything else I can find. When I attempted to pull the gas block and tube from the upper, the tube will not come out of the upper. It's stuck at the very end of the tube still in the upper. I'm still newer to ARs but I've never seen this before.
Since I can't complete the disassembly I'm just going to clean and lube everything and give it another shot at the range tomorrow with both Grendels and an additional lower running an A5 buffer. I plan on calling or emailing Wilson on Monday. I feel bad that I sold me friend on the Grendel and on the fact building is better than buying so you can get exactly what you want. I'm open for any suggestions?
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