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Posted: 2/22/2007 12:55:26 AM EDT
I've been planning to put together something like an SDM-R.

I like the idea of the MGI for the flexibility to change configurations.

Will the MGI offer the same level of accuracy with a good heavy stainless match barrel as a quality forged reciever like a CMT or LMT?

How about compared to a Larue or Vltor Billeted Upper?

Are there any "ideal" fitting dimensions for the barrel extension on a barrel to be used with the MGI upper?

Who would be a good source for an SDM-R configuration barrel set up to be used in an MGI upper (no barrel nut, etc.)?
Link Posted: 2/22/2007 4:10:35 AM EDT
Well, twl has stated that Advanced Barrel Systems uses an MGI QCB upper to accuracy test their barrels, and sub-MOA groups seem to be the norm for them, so I suppose there's little to no practical difference in accuracy.
Link Posted: 2/22/2007 2:36:36 PM EDT
It should have the potential for more accuracy-it's free-floated.  I'm using one of the older MGI models as a basis for a RECCE.  Make sure the barrels you buy for it come without the barrel nut and delta ring-you want them totally stripped behind the gas block.  
Link Posted: 2/27/2007 1:43:10 PM EDT

Originally Posted By whoanelly:
It should have the potential for more accuracy-it's free-floated.  I'm using one of the older MGI models as a basis for a RECCE.  Make sure the barrels you buy for it come without the barrel nut and delta ring-you want them totally stripped behind the gas block.  


Don't most barrels come standard with a barrel nut, and why would it be a problem? Can't you just slip it off.
Link Posted: 2/27/2007 2:34:39 PM EDT
You can, but for me it was a pain to remove the gas block.  
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