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Posted: 5/19/2016 2:31:32 AM EDT
| I just bought a new PSA upper and put it on a Bushmaster lower. Everything seems to function fine, but i have to gently tap the rear takedown pin with a small rubber mallet to get it in all the way. Needless to say, the upper and lower are very tight. The original Bushmaster upper was not loose, but i could easily push both pins in with my fingers. Is this normal, or am i just being paranoid over nothing? I want to make sure everything is right before taking it to the range. |
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Quoted:
I just bought a new PSA upper and put it on a Bushmaster lower. Everything seems to function fine, but i have to gently tap the rear takedown pin with a small rubber mallet to get it in all the way. Needless to say, the upper and lower are very tight. The original Bushmaster upper was not loose, but i could easily push both pins in with my fingers. Is this normal, or am i just being paranoid over nothing? I want to make sure everything is right before taking it to the range. This is not uncommon, the pins will and should loosen over time with use. The tolerances are just tight and need to be broken in. This is a far better challenge to have than the tolerance being too loose. Safety check at the range and enjoy. |
Thanks for the info.
| Steel takedown and pivot pins under spring pressure on an aluminum receiver. I notice more wear on receivers I swap uppers the most. It's just normal for these pieces to wear at friction points. I think it's important to understand that upper and lower fit have little to do with accuracy. Put 1000 rounds of M193 through your rifle and check again. |
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Quoted:
Steel takedown and pivot pins under spring pressure on an aluminum receiver. I notice more wear on receivers I swap uppers the most. It's just normal for these pieces to wear at friction points. I think it's important to understand that upper and lower fit have little to do with accuracy. Put 1000 rounds of M193 through your rifle and check again. If anything tighter is better. Rather have that than a wobbly upper. |
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