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Posted: 9/5/2013 8:21:12 AM EDT
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I have a 5.45 upper with a Ballistic Advantage 10.5 barrel and a Model 1 5.45 bolt. I assembled it and tried to hand cycle some rounds: Bolt wouldn't seat and if I forced it the rounds would stick in the chamber.
Measured bolt: .400" dia x .122" deep. Checks out OK. 7N6 ammo measured in spec also. Emailed BA and this was their response: "The barrel is headspaced for a 5.45 bolt with a depth of .130" +.002 / -.000 so a .122" bolt depth will definitely have tight headspace. Also, the lacquer coating on the 7N6 likes to stick to the chamber walls especially on a new barrel - that's one of the reasons we don't recommend hand cycling. This does not carry over at all when firing the gun. The casings will eject exactly as they should." Now I'm confused. Will it work or won't it? Any insight is appreciated. Thanks |
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If a round strips and chambers properly when you put a loaded magazine in and use the bolt release, it'll probably be fine. New rifles, especially, can be tight and have trouble hand cycling ammunition, but fire, extract and eject it just fine.
Clean the chamber well, and take it to the range for a test drive. |
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As long as head-spacing is good to go (almost always is) you should be good to go.
if you have never shot it before (and it sounds like you have not yet), then it probably is a bit tight all around. I have built three 5.45 AR's using Ballistic Advantage barrels and all three have been very good to go. Clean it, lube it up shoot it out. |
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Quoted:
If a round strips and chambers properly when you put a loaded magazine in and use the bolt release, it'll probably be fine. New rifles, especially, can be tight and have trouble hand cycling ammunition, but fire, extract and eject it just fine. Clean the chamber well, and take it to the range for a test drive. I slapped everything back together tonight and it strips and chambers a round using the bolt release. I did have to put my foot on the charging handle to eject the shell though. I think I may go ahead and shoot it. |
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Quoted:
I slapped everything back together tonight and it strips and chambers a round using the bolt release. I did have to put my foot on the charging handle to eject the shell though. I think I may go ahead and shoot it. Quoted:
Quoted:
If a round strips and chambers properly when you put a loaded magazine in and use the bolt release, it'll probably be fine. New rifles, especially, can be tight and have trouble hand cycling ammunition, but fire, extract and eject it just fine. Clean the chamber well, and take it to the range for a test drive. I slapped everything back together tonight and it strips and chambers a round using the bolt release. I did have to put my foot on the charging handle to eject the shell though. I think I may go ahead and shoot it. I'm scared to think how you got your foot on the charging handle on a loaded gun 
I wouldn't shoot it as is. It will put a lot of extra force/wear on the upper and BCG. |
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Quoted:
I'm scared to think how you got your foot on the charging handle on a loaded gun
I wouldn't shoot it as is. It will put a lot of extra force/wear on the upper and BCG. Quoted:
Quoted:
Quoted:
If a round strips and chambers properly when you put a loaded magazine in and use the bolt release, it'll probably be fine. New rifles, especially, can be tight and have trouble hand cycling ammunition, but fire, extract and eject it just fine. Clean the chamber well, and take it to the range for a test drive. I slapped everything back together tonight and it strips and chambers a round using the bolt release. I did have to put my foot on the charging handle to eject the shell though. I think I may go ahead and shoot it. I'm scared to think how you got your foot on the charging handle on a loaded gun
I wouldn't shoot it as is. It will put a lot of extra force/wear on the upper and BCG. Ugh. That was a poorly thought out euphemism for saying the shell was stuck pretty good. I actually had the rifle facing toward the floor with the charging handle lever on my bench and pushed down on the butt stock and grip. |
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