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Thread: Colt Sear Block incompatible with FA BCG

  1. #11
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    ack... **** a sear block. shave that POS right offa there.

    i also noted the stag looks like it needs another rotation
    Last edited by bkb0000; 06-12-09 at 03:29.

  2. #12
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    I have Zero expereince with Colt sear block items, but it looks like it may be the case. I would definitely do the extra rotation of the LRE on the Stag, but that's just me.



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  3. #13
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    These are the acceptable minimum and maximum buffer spring lengths for the rifle and the carbine.

    Rifle- 11 3/4 - 13 1/2 inches.
    Carbine- 10 1/16- 11 1/4 inches.



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  4. #14
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    The Stag does appear to need another rotation of the receiver extension, try it and make sure that the top of the receiver extension doesn't stick out of the receiver. As long as it doesn't and doesn't keep the buffer retainer from moving freely you're good. If it doesn't stick past the receiver but does keep the buffer retainer from moving you may need to notch it like the other one you have.

    Also there are some gunsmiths who can remove the hardened Colt block to allow the use of M16 carriers.

    I've seen some lowers that Sam Hatfield did this on and they came out great.
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  5. #15
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    Thanks everyone. 10-4 on the Stag extension, I'll try to crank it in another rotation.

  6. #16
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    I cut off my sear block flush with the lower using a cheap Wallmart dremel. Now I can run a M16 bolt.

  7. #17
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    Quote Originally Posted by sjc3081 View Post
    I cut off my sear block flush with the lower using a cheap Wallmart dremel. Now I can run a M16 bolt.
    hooah.

    always good to see people take initiative.

  8. #18
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    Just adding an update - Tried to get another rotation for the LRE on the Stag lower, no go. About 10 degrees short of being aligned vertically and could go no more...

  9. #19
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    Quote Originally Posted by esskay View Post
    Just adding an update - Tried to get another rotation for the LRE on the Stag lower, no go. About 10 degrees short of being aligned vertically and could go no more...
    dremmel a little notch in the RE to get it the rest of the way- the way it was in that photo is really really close to total no-go. that could very well slip out on you one of these days

  10. #20
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    Just to add additional info, I have an AR-15 BCG that came with my Saber Defense Middy upper, mounted on a colt a2 sporter lower with the same sear block. It works well. I always wondered if a FA BCG would work with the sear block. I guess I wasn't curious enough to swap and see. Thanks for the info. I'll get out the dremal and get to work!
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