I sent KRIEGER my (J.P SS tactical) bolt-carrier and they made sure everything was good to go, and matched up with my barrel setup. I don't recommend going with the largest diameter barrel, or the longest, IMO and Krieger's, it isn't necessary. A 20" SS or chrome-moly should work nice for you. Here is a pic of my current "KRIEGER CARBINE" 16.25" 1-9, chrome moly (solid 1/2 MOA or under @100 w/Black Hills 63gr MOLY). For what it's worth, DIEMACO also uses KRIEGER barrel blanks, on occasion.
Here's some ideas:
- J.P. 3-3.5lb single stage trigger, or some prefer accuracy speaks or knight's triggers.
- I have a Colt M4 flat top upper (as marked), with feed ramps. Not a requirement by any means, RRA and Bushy are good too.
- LMT bolt/carrier, or J.P. Enterprise Stainless Tactical or Low Mass (competition only)carrier. again, just my opinion.
- I really like my new ACE M4 SOCOM adjustable stock, but you may prefer normal A2 stock for your purposes.
- Also happy with KAC Free Float tubes, such as my MRE.
- J.P. Adjustable gas block lets you fine tune the gas pressure/bolt movement.
KRIEGER's are $$$, and they aren't chrome-lined. Good luck
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