Your recommendation for a top quality BCG for a CC/Diemaco build

UR2X3M4ME

UR2X3M4ME

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Working on a Colt Canada/Diemaco build (SA20 lower + IUR upper) and currently in need of a matching BCG. While, I have a strong preference for one from the very same manufacturer, I may have to resort to procuring a group from an alternate source but I do worry about a less than perfect match (possible headspacing issue?).

Q1: Can headspacing be an actual issue if using alternate manufacturer BCG?

Q2: As an alternate to a CC/Diemaco BCG, what other top quality alternate do you suggest I look into?
 
With mine, i went with BCM full auto BCG. very impressed with BCM quality, though have not shot it yet. Waiting for my Colt lower to arrive.
 
Thanks all for your replies.

Almost went for a BCM or a Phase5.

Mil Specs. In theory and in most cases it will do. Except that in this world of tolerances, QC, and management/commercial decisions, I have learned the hard way that dimensional marginal ccrraapp regularly leaks out. I had to deal a warranty issue (headspacing) that lasted a year with a given brand name. Makes me super cautious now.

Anyhow, here is what I decided on and its on its way. Beware, they don't ship to Canada.

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Received.
Perfect in form, function and fit at dry firing dummies. Finish is flawless.
Just waiting on a few more bits and my Colt-Diemaco IUR build will be complete. Anxious to try the BCG with the real stuff. Hopefully in 3 weeks.
 
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