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9/22/2017 12:11:25 AM
Posted: 8/30/2005 6:06:15 PM EDT

Greetings and thanks for looking. I own a 20" Colt 1 in 7 twist barrel that I would like to put on an A4 flat top receiver like this one:

SA03010: UPPER RECEIVER ASSY(.250) - RIFLE, M16A4 (AR6700, MT6700, R0901, R0945), INCL. EJ PORT COVER ASSY, FORWARD ASSIST ASSY, CARRY HANDLE ASSY

I am being told by a reputable source that this cannot be done since "... The front sight base on the barrel has to be taller to match with the removable carry handle sights otherwise you will have a weapon that will not zero". Is this true or a misunderstanding by this person? Please help me out with this.

Thanks,
Bigfeet
Link Posted: 8/30/2005 6:13:22 PM EDT
Blah, blah, blah.....................................................you're good to go. If you have problems zeroing it in, the worst thing that could happen is that you will need to buy a taller front sight post from Bushmaster, but this setup usually works fine with 20" barrels.
Link Posted: 8/30/2005 6:14:32 PM EDT
Link Posted: 8/30/2005 6:15:20 PM EDT
Link Posted: 8/30/2005 6:19:43 PM EDT


Damn, you guys are fast. Well here is the interesting part, I just purcased one of the few Colt A4 uppers out there on the market (according to the seller) right now. The front sight post is the same as the one on my Colt barrel. Based on that and what you guys have said, it sounds like I am good to go!! Thanks for the quick information.

Given that, I need to get a Delta ring, gas tube, receiver, and what else?


Thanks Guys,
Bigfeet
Link Posted: 8/30/2005 6:27:33 PM EDT

Originally Posted By Bigfeet:

Given that, I need to get a Delta ring, gas tube, receiver, and what else?

Thanks Guys,
Bigfeet


Are you building just the upper half or the whole rifle?
Link Posted: 8/30/2005 6:42:13 PM EDT

Originally Posted By Alpha-Romeo3:

Originally Posted By Bigfeet:

Given that, I need to get a Delta ring, gas tube, receiver, and what else?

Thanks Guys,
Bigfeet


Are you building just the upper half or the whole rifle?



Sorry upper first, and then I will buy the complete lower....


Bigfeet
Link Posted: 8/30/2005 11:19:09 PM EDT
Other parts you'll need:

A2 flash suppressor
flash suppressor crush washer
rifle gas tube
gas tube pin
barrel nut

delta ring assembly:
handguard retainer ring (snap ring)
slip ring spring assembly (weld spring)
delta ring

charging handle assembly
bolt carrier group
A2 rifle (round) handguard assembly
back up iron sight

If you want to make an A4 clone substitute a Knight's Armament M5 RAS rail handguard, a Knight's 300 m back up iron sight and a M16 bolt carrier group.

If you're going to assemble it yourself you will need an action block, a large vise and barrel wrench. Take a look at the tacked posts in the build it yourself forum for instructions.

You could also have a gunsmith assemble it for you if you don't want to buy those tools.

Here's a pic of my Colt M16A2 clone build.

My Colt M16A2 clone pic link

Good luck on your project.
Link Posted: 8/31/2005 4:05:28 AM EDT
Yea, can't be done.





Link Posted: 8/31/2005 4:25:50 AM EDT

Outstanding. Thank you all for the useful information!!


Bigfeet
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