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Posted: 5/29/2006 8:43:01 PM EDT
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I have a bushmaster old upper 11.5" barrel with fixed 5" flash hider lower is a vltor carbine stock. I load a magazine insert it and chamber a round and fire, the fired round gets extracted and thats it. I put the upper on a different lower with a different bolt and carrier and the upper runs fine I then swap back the original bolt and carrier on the new lower and it doesnt run.. it double feeds and then fires the chamber round, extracts the spent casing bbut again wont chamber a new round. I dont know whats the problem ?? |
So the m16 BCG works with the standard buffer, and any other configuration doesn't work? Sounds to me like you're short stroking. Try changing your buffer on the lower that doesn't work, and if needed go with the same carrier in both. |
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Tighten the allen bolts to 35-37 in lbs (if you do not have a torque wrench, this is about the force needed to start to bend a small L type allen wrench). Also, if the bolts are in question, it's best to just replace the both instead of them snapping off or stretching if they have been over torque from the start. Once tighten, you will stake the key metal/surface to flow it’s metal into the nuts side spines (the key should already be staked, so you will just need to restake in the same spot on the key). |
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