Ban era Colt lower

AR/M4 AR Technical Discussion
1

I have a ban era Colt lower that has a block behind the hammer which prevents the use of a full circle BC. It appears to be installed with an 8mm transverse pin which didn’t budge with a couple of mild taps. Is there a secret to removing this block? Bigger hammer?
Thanks for indulging my first post.

2

My understanding is it must be milled out. ADCO will do it for around 50 bucks. Then your good to go.

3

I would not attempt this at home… This is a job that I would send out to a pro…

B

4

Here is more on this topic…

https://www.m4carbine.net/showthread.php?t=10524

B

5

Thank you gentlemen for the info and the link.

6

I’d just buy a different lower.

7

I could see buying a different lower. Why not sale to somebody in such a situation to help finance a new lower?

8

Leave the sear block in and use a semi BCG. As long as the semi BCG has a full shroud for the firing pin it’ll work fine.

The whole “auto carrier = better” thing is mostly hype.