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Posted: 6/15/2009 6:25:02 PM EST
This is what I have

20in Colt upper, A1 upper, with a A2 barrel.

I want to switch out the A1 upper for a A3 upper.

Are M4 feedramps on the receiver or the barrel?

Can I use a Upper with M4 feedramps on that barrel or do I have to get one with no feedramps?

Thanks
Link Posted: 6/15/2009 6:37:25 PM EST

Originally Posted By psegnatelli:
This is what I have

20in Colt upper, A1 upper, with a A2 barrel.

I want to switch out the A1 upper for a A3 upper.

Are M4 feedramps on the receiver or the barrel?

Can I use a Upper with M4 feedramps on that barrel or do I have to get one with no feedramps?

Thanks

You would have a rifle barrel extension, and an upper with M4 cuts... a HUGE no-no.

You need an upper w/o the cuts.
Link Posted: 6/15/2009 7:16:51 PM EST
Link Posted: 6/16/2009 2:37:55 AM EST
Thanks for the info! Just what I was looking for.

Nice Pic, Explains alot.
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