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Posted: 9/22/2007 7:00:40 PM EDT
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I got around to shooting my new 16" delton midlength upper this weekend. The bolt was failing to lock back and I had several misfeeds (the bolt seemed like it wasn't coming far enough back to catch the rear of the next round to strip it out of the mag). I swapped out the gas block when I first got it for one of the 4 railed ones. I also don't know if I got the retaining pin for the gas tube in completly. The rifle shot very accurately and the bolt doesn't feel like its binding on the gas tube. When I was tightening down the flash hider I remember the FF forearm twisting a little. I straightened it out but is there a posibility that pinched the gas tube? Where would you guys start? |
| sounds like an alignment issue with the gas block. Can be a frustrating gremlin to chase down. I usually shoot one round at a time when I'm chasing alignment issues on them because I want to see if the bolt carrier is going back far enough to lock back on the last round. A sometime frustrating but easy fix. |
Nothing standard. I recently installed a YHM Folding Front Sight and used a thin Sharpie marker to draw alignment marks on the front sight as well as the barrel. You’ll have to use a little ingenuity and come up with a way to verify alignment.
Yes, you are correct. If the gas block’s gas port is not inline with the barrels gas port, then you are restricting gas flow back to the bolt which can lead to short stroking. |
| Took it to the range last night and played with it till it started spitting out cases. Had to actually move it towards the muzzle a little. After that the bolt seemed to slam shut and sound like it was locking up tighter. Was getting an inch and a half out of everything I shot through it with a 4x scope. I'm very happy with my Del-ton upper. |
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I am glad i read this to see if there could be issues swapping out a gas block. I always wondered if there was a trick to lining up the gas port. Apparently not. Maybe that is why so many people cut down their FSB instead of just buying a low profile gas block, like i want to do someday. I was wondering, do you still have the endcap on? or do you have a railed handguard rather than standard handguards with an endcap? That might account for having to move the gas block forward from the shoulder that holds the endcap on. I am glad to see you have it working. |
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