My opinions are above in blue.
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If this AR is to be used hard for possible self defense or at a training course I'd do the following:
1. Better staking of gas key (I'd replace key with a BCM key and screws and stake with a MOACKS)
2. Install mil-spec receiver extension and stake (Not needed your AR currently, Mil-Spec receiver extenstions are for CAR stocks, your Sully uses a 'entry length' rifle receiver extension which use a CAR buffer and spring)
3. Install heavy-duty extractor spring and insert (I'd get the BCM SOPMOD upgrade kit which includes an extractor, pin, spring, buffer, Crane O-ring and gas rings or better yet replace the bolt with a BCM unit and use your Bushmaster bolt as a backup.)
4. I am also considering the MGI Buffer - is it worth it? (I'd just use an H buffer from CMT and a standard power chrome silicon spring)
5. Chip McCormick trigger group - any comments on this product (I've been shooting competitively for over 25 years and can make good use of a crisp trigger pull)? (McCormick trigger groups are pretty good but they have a tendency to double after awhile, for a 'social' gun I'd run a stock FCG or a Geiselle)
Not related to reliability, but I am also having the AK Concepts FSC556 compensator installed in place of the lame "Izzy brake" that came from the factory (and not indexed perfectly straight as typical of BM QC). (If the FSC556 perm. mounted will make 16" it's a good choice it's a great brake and flash hider).



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