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Posted: 2/3/2012 2:52:15 PM EDT
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I completed my ar today. But i have a problem. 1St off i have not fired the wep yet. When i pull the charging handle all the way back the end of the bolt will not catch on the bolt catch. I have a 11.5 bmc upper and spikes lower and bcg. I have a PSA LPK. I have a carbine buffer and spring. The spring is 11in. long, some say 10.5 to 11.1 are ok. Here are some pics
With out mag http://i1244.photobucket.com/albums/gg578/dlc3011/IMAG0399.jpg With Mag http://i1244.photobucket.com/albums/gg578/dlc3011/IMAG0401.jpg Only way it will hold the bolt http://i1244.photobucket.com/albums/gg578/dlc3011/IMAG0406.jpg The lower http://i1244.photobucket.com/albums/gg578/dlc3011/IMAG0409.jpg Thanks. |
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What type of stock & buffer tube, and what type of buffer are you using? I am thinking that you have screwed the buffer tube in too far, the buffer tube is too short or possibly has bad machining on the inside so it is keeping the buffer from moving all the way to the rear, or possibly that you have a buffer that is too long.
CY6 Greg Sullivan "Sully" SLR15 Rifles TheDefensiveEdge.com (763) 712-0123 |
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The overlap on the rear of the bolt catch is supposed to be there.
If it is a collapsible stock you should check the depth of the tube. The tube should be about 7" deep at the top/side without the lip hanging out. There was a company that made some to shallow and the carrier could not retract far enough. I think they were ATI ? If it is a collapsible stock tube check the coil count on the spring. It should be about 38 coils. If it is about 44 coils you have the wrong spring. If it is a collapsible stock the length of the buffer could be checked but I have never seen one to long. The buffer is bout 3 1/4" long. If it is an A1 rifle length stock make sure you do not have the longer screw in it that is for the A2 style stock that has a spacer to lengthen the stock. |
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Quoted:
The overlap on the rear of the bolt catch is supposed to be there. If it is a collapsible stock you should check the depth of the tube. The tube should be about 7" deep at the top/side without the lip hanging out. There was a company that made some to shallow and the carrier could not retract far enough. I think they were ATI ? If it is a collapsible stock tube check the coil count on the spring. It should be about 38 coils. If it is about 44 coils you have the wrong spring. If it is a collapsible stock the length of the buffer could be checked but I have never seen one to long. The buffer is bout 3 1/4" long. If it is an A1 rifle length stock make sure you do not have the longer screw in it that is for the A2 style stock that has a spacer to lengthen the stock. This, or what Sully said about the tube being screwed in to far or bad machining on the interior that is preventing full draw on the buffer. Your fix of grinding the catch down, sounds like a bandaid that may allow you to lock back by hand, but I would be surprised if it works during firing. From the looks of that catch, it didn't look out of spec, but if you measured it and it was off maybe that was it. The bolt lugs should retract slightly beyond the catch, so I don't think that the thickness of the catch was your real problem. |
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Quoted:
Quoted:
The overlap on the rear of the bolt catch is supposed to be there. If it is a collapsible stock you should check the depth of the tube. The tube should be about 7" deep at the top/side without the lip hanging out. There was a company that made some to shallow and the carrier could not retract far enough. I think they were ATI ? If it is a collapsible stock tube check the coil count on the spring. It should be about 38 coils. If it is about 44 coils you have the wrong spring. If it is a collapsible stock the length of the buffer could be checked but I have never seen one to long. The buffer is bout 3 1/4" long. If it is an A1 rifle length stock make sure you do not have the longer screw in it that is for the A2 style stock that has a spacer to lengthen the stock. This, or what Sully said about the tube being screwed in to far or bad machining on the interior that is preventing full draw on the buffer. Your fix of grinding the catch down, sounds like a bandaid that may allow you to lock back by hand, but I would be surprised if it works during firing. From the looks of that catch, it didn't look out of spec, but if you measured it and it was off maybe that was it. The bolt lugs should retract slightly beyond the catch, so I don't think that the thickness of the catch was your real problem. The tube is 7in. deep. The spring is the right size, same with the buffer.With the upper off and the charging handle pulled all the way back with the bcg, the bolt will not go past the bolt stop. When a working bushmaster lower, we mated my upper with no problems. The lower would not hold the bushmasters uppers bolt locked. We too out the bcg, buffer spring, buffer, charging handle, from my build and placed it on his upper. All worked as designed. After taking just a little off the PSA LPK's bolt stop, the weapon runs wolf like a champ! Thanks for all the help. |
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Quoted:
Quoted:
Quoted:
The overlap on the rear of the bolt catch is supposed to be there. If it is a collapsible stock you should check the depth of the tube. The tube should be about 7" deep at the top/side without the lip hanging out. There was a company that made some to shallow and the carrier could not retract far enough. I think they were ATI ? If it is a collapsible stock tube check the coil count on the spring. It should be about 38 coils. If it is about 44 coils you have the wrong spring. If it is a collapsible stock the length of the buffer could be checked but I have never seen one to long. The buffer is bout 3 1/4" long. If it is an A1 rifle length stock make sure you do not have the longer screw in it that is for the A2 style stock that has a spacer to lengthen the stock. This, or what Sully said about the tube being screwed in to far or bad machining on the interior that is preventing full draw on the buffer. Your fix of grinding the catch down, sounds like a bandaid that may allow you to lock back by hand, but I would be surprised if it works during firing. From the looks of that catch, it didn't look out of spec, but if you measured it and it was off maybe that was it. The bolt lugs should retract slightly beyond the catch, so I don't think that the thickness of the catch was your real problem. The tube is 7in. deep. The spring is the right size, same with the buffer.With the upper off and the charging handle pulled all the way back with the bcg, the bolt will not go past the bolt stop. When a working bushmaster lower, we mated my upper with no problems. The lower would not hold the bushmasters uppers bolt locked. We too out the bcg, buffer spring, buffer, charging handle, from my build and placed it on his upper. All worked as designed. After taking just a little off the PSA LPK's bolt stop, the weapon runs wolf like a champ! Thanks for all the help. Wow, well that's awesome. Glad she's up and running. |
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