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Posted: 1/24/2017 9:09:42 PM EDT
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I am totally new at retro. No lie.
I have a few A1 parts stashed, but am tied up with A2 builds at the moment. Anyhow, a pal of mine jumped in head first. He calls me tonight and says.... "I cannot get my bcg to pull back far enough to lock. The bcg is hitting my stock." Says he talked to PSA(bcg came from there) and Model 1 Sales (A2 complete upper came from there) and then tells me. " The guy at PSA says Colt made a shorter carrier for use with that buttstock". ?????? He says it's a Type C surplus stock. Using an A2 RE/spacer/screw. Any ideas???? I'm in over my paygrade here. Edit: RRA A2 lower PSA premium bcg A2 20 govt bbl upper triangle handguards standard charging handle |
| The A2 spacer is on the outside of the tube, so that's not the issue. There might be something stuck in the back of the tube. I would look in there with a flashlight. Bolt carriers are all the same length as far as I know. They have to be, so when the bolt is locked into the chamber the back is flush with the buffer head. |
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Quoted:
The A2 spacer is on the outside of the tube, so that's not the issue. There might be something stuck in the back of the tube. I would look in there with a flashlight. Bolt carriers are all the same length as far as I know. They have to be, so when the bolt is locked into the chamber the back is flush with the buffer head. i don't think you can use an a2 spacer with an a1 stock and still have it fit against the receiver. it'll just spin since the little nub doesn't interlock with the recess in the lower. my guess is he's using the a2 stock screw on an a1 stock meaning the screw is protruding into the tube and the buffer is bottoming out against the screw prematurely. |
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Colt didn't make a shorter carrier. That is bad info.
Most likely he's using an A2 stock screw (the screw at the top of the buttpad that holds the stock onto the buffer tube). The A1 screw is the same as the A2 only shorter. I'd have him remove the screw completely, and then see if the carrier will fully retract. If it does, he's found the problem. John Thomas |
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As mentioned above the most likely possibility is that he is using an A2 buttstock upper "long" screw with an A1 type "A thru E" buttstock which should use a "short" upper screw. The "long" screw is sticking into buffer tube and not allowing the buffer full travel.
Other possibilities: 1. That he has a carbine buffer spacer inside his rifle length buffer tube and is trying to still use a rifle length buffer and spring with the spacer. The spacers are used when you want to use a carbine buffer and spring in a rifle length buffer tube. 2. That he is using an even shorter then A1 buttstock like a UTG/Leapers compact stock which uses a carbine length buffer tube and will not work with a rifle length buffer and spring. |
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*Update*
The problem is the stock screw. He was trying to use an A2 long screw in the top buttstock hole, thus impeding carrier travel, by ~5/8". His stock does appear to be a type C, although I am not certain. It matches pics/description and has beautiful mottling. Again, I am new to this and cannot confirm. Thanks everyone for helping resolve this. Without your collective input, we would still be scratching our heads. |
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Quoted:
Colt didn't make a shorter carrier. That is bad info. Most likely he's using an A2 stock screw (the screw at the top of the buttpad that holds the stock onto the buffer tube). The A1 screw is the same as the A2 only shorter. I'd have him remove the screw completely, and then see if the carrier will fully retract. If it does, he's found the problem. John Thomas John, I just wanted to say thanks personally for you taking the time also. I hear nothing but good about you and your skills. Hope to deal with you on future builds. Tig |
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John, I just wanted to say thanks personally for you taking the time also. I hear nothing but good about you and your skills. Hope to deal with you on future builds. Tig Thanks very much. I'm glad to see he got the problem figured out, and it was a cheap, easy fix. John Thomas |
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It's kind of hard to tell the difference between a Type C and a Type D. You can't go by the finish. The best ways to tell, are the bend in the neck, and the fact that Type "C" stocks are thinner. Type "D" stocks can be matte or mottled, shiny, etc. Checkout these pics:
Left to right: Type "A", Type "C", Type "D", Type "C" 
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Quoted:
It's kind of hard to tell the difference between a Type C and a Type D. You can't go by the finish. The best ways to tell, are the bend in the neck, and the fact that Type "C" stocks are thinner. Type "D" stocks can be matte or mottled, shiny, etc. Checkout these pics: Left to A", Type "C", Type "D", Type "C" http://www.ar15.com/media/mediaFiles/96324/15252.JPG http://www.ar15.com/media/mediaFiles/96324/15226.JPG Well judging by the pics you posted, I would tend to believe that he has a "D" stock. The bend and neck thickness closest receiver more closely match his. Thanks for the pics. I see I am in for learning experience once I start my A1 build. 
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