I’ve run into an alignment issue and would appreciate opinion(s) on how to proceed.
I’m working on a rifle project that is based on an AR15 platform. The lug holes for the pivot pin and takedown pins are properly aligned when the upper and lower receivers are separate from each other. The pins travel through the lugs smoothly.
However, when the upper and lower receivers are mated together, there is a problem. The pivot pin holes of the lower receiver do not match well with the pivot pin holes of the upper receiver. The pivot pin can be hammered through to home. But, a punch and hammer are required to remove the pin. Please note that the alignment of the holes for the takedown pin are very good when the upper and lower receivers are mated together.
I’ve mated the problematic upper receiver with another lower receiver and the misalignment persists. Thus, the misaligned holes are associated with the upper rather than the lower receiver.
I have several options (ranked from least to most risky):
1. Do nothing. Usage will loosen travel through the misaligned holes for the pivot pin.
2. Turn down the pivot pin until it travels through the pivot pin holes more easily
3. Replace the upper receiver
4. Line bore the hole for the pivot pin while the upper and lower receivers are mated together
I’m working on a rifle project that is based on an AR15 platform. The lug holes for the pivot pin and takedown pins are properly aligned when the upper and lower receivers are separate from each other. The pins travel through the lugs smoothly.
However, when the upper and lower receivers are mated together, there is a problem. The pivot pin holes of the lower receiver do not match well with the pivot pin holes of the upper receiver. The pivot pin can be hammered through to home. But, a punch and hammer are required to remove the pin. Please note that the alignment of the holes for the takedown pin are very good when the upper and lower receivers are mated together.
I’ve mated the problematic upper receiver with another lower receiver and the misalignment persists. Thus, the misaligned holes are associated with the upper rather than the lower receiver.
I have several options (ranked from least to most risky):
1. Do nothing. Usage will loosen travel through the misaligned holes for the pivot pin.
2. Turn down the pivot pin until it travels through the pivot pin holes more easily
3. Replace the upper receiver
4. Line bore the hole for the pivot pin while the upper and lower receivers are mated together