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9/22/2017 12:11:25 AM
Posted: 8/11/2003 12:11:37 PM EDT
I have a Colt lower that still has the sear block in it. I was told that a standard bolt carrier will not work unless the sear block is removed. I placed my bushmaster upper onto my Colt lower and cycled the bolt a few times and never noticed any contact between the carrier and the sear block. Also, there was no noticeable wear on the surface of either piece. From what I can tell there is just enough clearance for it to work. Was someone just pulling my leg when they told me this or is it true? I have not attempted to fire it in this configuration yet because I wanted to find out from you guys if it can be done first. Thanks.
Link Posted: 8/11/2003 12:37:01 PM EDT
[Last Edit: 8/11/2003 1:04:19 PM EDT by sf46]
The sear block Colt lower will only prevent installation of a drop in auto sear. It will function with normal AR parts like you described. The Colt "half-moon" bolt carrier normally associated with this lower was designed to prohibit use of the AR-15 to M-16 bolt carrier converter device. The sear block which is easily and legally removed has no effect on any "full-circle" bolt carriers.
Link Posted: 8/11/2003 2:18:08 PM EDT
It should work fine. Watch-Six
Link Posted: 8/11/2003 3:44:37 PM EDT
Thanks guys. That's what I wanted to hear. I didn't really want to remove it unless I had to.
Link Posted: 8/12/2003 11:10:57 AM EDT
My M4 colt upper with the M-16 carrier will not close onto my pre-ban colt lower with the sear block. Put the ar 15 carrier into the M4 upper and no prob. So check first. Just my experience. Spooge Out!
Link Posted: 8/12/2003 12:41:32 PM EDT
Originally Posted By Spooge5150: My M4 colt upper with the M-16 carrier will not close onto my pre-ban colt lower with the sear block. Put the ar 15 carrier into the M4 upper and no prob. So check first. Just my experience. Spooge Out!
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Bingo! We have a winner! You just discovered why Colt put in a sear block with a piece of it protruding up into the upper receiver. The block serves two purposes, you cannot use a sear or a M16 carrier. If you ever looked at a Colt AR15 in 9MM with a sear block, you would notice that this part of the block is cut off because the 9MM carrier is the same for semi and full auto. Go figure!
Link Posted: 8/12/2003 3:04:19 PM EDT
What did I win!?[bounce] What did I win!?[bounce] I'll take door number........ [thinking] 3! [party]
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