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This is the first I heard of this. Please explain more.
Bought the 1st one and I went to build everything was tight, too tight. The rear pivot pin would not go through and the alignment between the upper and lower were about 1/8" off. Drove back to Ludlow, John took the parts off the lower and put it on another lower while I waited. Took it home and set it aside for a week while I waited for a rear BUIS. After BUIS install I decided to oil the heck out of it because I wouldn't be shooting it for a while. Tried to push the rear pivot pin out with my finger, no go, had to use a punch to drive it out. once out I noticed that again the alignment was off again by about 1/8" and would only line up if I forced the heck out of it. Thinking it was my upper I went to 4S and bought a Stag lower. Moved the LPK over to the Stag and it fit like a glove, nothing was too tight.
I then trouble shot the old lower and found out that the forward assist housing was hitting the shoulder by the buffer. One hour with the Dremmel and I finally got it to the point of not having to force the pivot pin.
Not a good experience on the first build.
Colt lowers with a sear block installed will work fine with an AR-15 carrier. The only carrier that will not work is the M-16 style.
Maybe but wtf is a "AR-15 carrier"
Problem is there is the Mil Spec for the M16 then everybody with a bridgeport makes up the AR-15 standard as they see fit. So yeah, the Mil Spec bolt carrier won't work with the COLT sear block but everything else I would rate at "probably".
mind you, since you didn't specify, this does not hold true for AR's chambered in 7.62 Nato. Only the ar-15 platform.
"BCG - bolt "carrier" group, I believe that was what he was referencing by saying AR-15 carrier.
In addition to that, most BCGs sold today are the m-16 style, at least every one that I have compared over the past year, or 2 has been the FA style.
yup, I am familiar with the BCG, we're old friends in fact
anywho, my point is there is a Mil Spec M16 BCG and then there is everything else (non-mil spec). There's no one design spec for a AR15 BCG.
Doesn't the OP also have to worry about commercial or MILSPEC buffer tubes?
what Terminator said, and every AR build thread should have the disclaimer:
Building your own AR with quality new parts does not typically save you any money. People do it more for the experience.
Building your own will save you the 11% Federal tax that is charged on Long Guns (as long as you don't order the parts all at once).