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Posted: 5/7/2014 1:42:05 PM EDT
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I have a precision rifle I am putting together and I seem to have gas related issues. The rifle is not cycling all the way back to pick up the next round. I have tried 3 different ammo version and it's only ejecting about a foot and half away from the port. I have tried another lower from one of my carbines with similar results and a different bolt and carrier. It's well lubed.
I am using a Veltor low profile gas block on a 20" Kreiger barrel with a rifle tube. On the back end I have a PRS stock with a rifle buffer, tube, and spring. I took the gas block off and it was tight, the hole appeared lined up with the gas block hole. The hole on the barrel will almost fit a 3/32 drill bit in. The holes on the gas block and tube appear to be larger than the barrel gas hole. The gas key on both bolts are fine. What else could cause it to short stroke? |
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Quoted:
I have a precision rifle I am putting together and I seem to have gas related issues. The rifle is not cycling all the way back to pick up the next round. I have tried 3 different ammo version and it's only ejecting about a foot and half away from the port. I have tried another lower from one of my carbines with similar results and a different bolt and carrier. It's well lubed. I am using a Veltor low profile gas block on a 20" Kreiger barrel with a rifle tube. On the back end I have a PRS stock with a rifle buffer, tube, and spring. I took the gas block off and it was tight, the hole appeared lined up with the gas block hole. The hole on the barrel will almost fit a 3/32 drill bit in. The holes on the gas block and tube appear to be larger than the barrel gas hole. The gas key on both bolts are fine. What else could cause it to short stroke? Ammo type? If the gas port is ~3/32", it's certainly large enough IMO, at least compared to a carbine. Are there any burrs on the gas block? Also, might not be a bad idea to check the screws on the bolt carrier key. If for some reason too that the key's hole is blocked, that could cause some short stroke issues. |
| It's failing but not consistently. Sometimes I can get multiple rounds off. Yes the block is against the shoulder. Shouldn't it be? It appeared to have a perfect carbon build up around the gas hole on the barrel which I thought would indicate the gas block hole and the hole on the barrel were lined up? |
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Quoted: It's failing but not consistently. Sometimes I can get multiple rounds off. Yes the block is against the shoulder. Shouldn't it be? It appeared to have a perfect carbon build up around the gas hole on the barrel which I thought would indicate the gas block hole and the hole on the barrel were lined up? |
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Quoted:
It's failing but not consistently. Sometimes I can get multiple rounds off. Yes the block is against the shoulder. Shouldn't it be? It appeared to have a perfect carbon build up around the gas hole on the barrel which I thought would indicate the gas block hole and the hole on the barrel were lined up? in my experience the gas port on the barrel and the hole on the gas block line up a hair in front of the shoulder, the gas block shouldn't be against the shoulder. Again, just my experience. YMMV |
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Quoted: I don't know if that matters too much. Example on my M4A1 clone, my DD gas block is against the shoulder, and based on measurement, the entire gas port is open under the hole in the gas block, but YMMV. |
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A lot depends on the barrel manufacturer and gas block purchased. The Viltor on my 16" middy had to be backed off to line up... Quoted:
Quoted:
I don't know if that matters too much. Example on my M4A1 clone, my DD gas block is against the shoulder, and based on measurement, the entire gas port is open under the hole in the gas block, but YMMV. In my case, a Colt barrel and Daniel Defense gas block. Maybe tolerance stacking in my favor? |
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Quoted: In my case, a Colt barrel and Daniel Defense gas block. Maybe tolerance stacking in my favor? Quoted: Quoted: Quoted: I don't know if that matters too much. Example on my M4A1 clone, my DD gas block is against the shoulder, and based on measurement, the entire gas port is open under the hole in the gas block, but YMMV. In my case, a Colt barrel and Daniel Defense gas block. Maybe tolerance stacking in my favor? |
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