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9/22/2017 12:11:25 AM
Posted: 3/10/2006 12:28:13 PM EDT
Which Colt lower receiver is more desirable? A Pre94 R6551 Sporter target, mag fence, small front pivot (non push pin) and sear block or a current R6520 Goverment Carbine, LEO marked lower?
Link Posted: 3/10/2006 12:35:34 PM EDT
Newer lower unless behind enemy lines. [IE KALI. ETC.] You can use the lower on more manufacturers uppers without the hassle. No block is better. More choices of carriers.
Link Posted: 3/10/2006 12:57:51 PM EDT
+1

I agree with any newer Colt commercial or LE models because of no protruding sear block.

If you would like the push pivot pin type make sure the one you get have a hole for the detent pin and pin spring.

My favorite is my Colt AR6721 LE model because I like the roll marks of "AR-15A3 Tactical Carbine".

I'm also using a M16 BCG.

Good luck.
Link Posted: 3/10/2006 1:00:16 PM EDT
Link Posted: 3/11/2006 2:41:37 PM EDT

Originally Posted By Alpha-Romeo3:
+1

I agree with any newer Colt commercial or LE models because of no protruding sear block.




Alpha- Could you 'splain what you mean by a 'protruding sear block'? The block on my Colt is flush with the top of the receiver. Were they not always so?
Thanks,
Moon
Link Posted: 3/11/2006 3:12:56 PM EDT
[Last Edit: 3/11/2006 3:13:16 PM EDT by theshootersden]

Originally Posted By Alpha-Romeo3:
My favorite is my Colt AR6721 LE model because I like the roll marks of "AR-15A3 Tactical Carbine".

I'm also using a M16 BCG.



Ditto...
Link Posted: 3/11/2006 10:00:33 PM EDT

Originally Posted By halfmoonclip:

Originally Posted By Alpha-Romeo3:
+1

I agree with any newer Colt commercial or LE models because of no protruding sear block.




Alpha- Could you 'splain what you mean by a 'protruding sear block'? The block on my Colt is flush with the top of the receiver. Were they not always so?
Thanks,
Moon



Picture from team member CJan_NH from the archive server

Colt added a protruding sear block above the top of the lower receiver and pinned with an oversized pin just above the fire markings of the selector, roughly about '89 to prior to the AWB.

Then after that they just added an unmachinned web (flush with the top of the receiver) in the same location as the sear block, which is still the current method.
Link Posted: 3/11/2006 10:16:44 PM EDT
Not trying to promote anything illegal, but doesn't that just provide you with a sear hole once you dremel the block out?


TS
Link Posted: 3/11/2006 10:37:32 PM EDT

Originally Posted By TigerStripe:
Not trying to promote anything illegal, but doesn't that just provide you with a sear hole once you dremel the block out?


TS




No, the hole is way too big, if you removed the sear block pin and tried to put an autosear in it would just flop around in the hole.
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