A few changes you might want to consider...
This is an almost must have:
http://www.ar15.com/forums/topic.htm...f=218&t=150131
The D-Fender will help solve some of the exraction issues that seem common with the really short uppers.
Then I would suggest looking at a heavier buffer (say a 9mm buffer). This will help prevent the harsh bolt bounce common with shorties...
Let me know if these two things help... Model 1 Sales tends to be a "less expensive" manufacturer so I am curious why you bought there?
http://www.cmmginc.com/ has a shorty upper that I would have much more confidence in if I was trusing my life to it:
See:
http://cmmginc.secure-mall.com/shop/...368832&cat=43&
Quote:
CMMG M7SG 7.3 Upper
New 7.3" M7SG MedCon upper. The M7 SG upper features a unique secondary micro gas block that diverts gas early into a standard gas tube with a second hole. Gas diverted forward enters an expansion chamber, created by forward portion of the gas tube, making initial unlock “softer”. This saves wear and tear on the weapon. Since the gas port is further from the muzzle there is greater residual pressure to ensure increased reliability with ammo ranging from 45 to 77 gr. This upper is built around the M7 multi-role barrel and comes with a four rail free float handguard and is complete with bolt, carrier and charging handle. CMMG semi auto bolt carriers have the shrouded firing pin to protect against hammer wear. Upper receivers are "T" marked and include extended feed ramp cuts. Features include medium contour barrel, 11 degree recessed target crown, chrome-lined 5.56mm chamber and bore, 1/7 twist, parkerizing under “F” marked forged front sight base and magnetic particle testing on every barrel. When ordering with optional gas block, barrels will not be drilled for taper pins. Barrel is marked CMMG MPC 5.56 NATO 1/7.
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