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I built this upper with left over parts from my 5.45 build. The old parts used were a spikes upper receiver, YHM free float handguard, bolt carrier. The new parts were a TR Enabling chrome lined 7.62x39 barrel 16" carbine GS $159. Ebay, lopro steel gas block $9 shipped, gas tube $11 shipped and bird cage $13 shipped and a tactical ambush 7.62x39 bolt $39/ $6 shipping? Magazines were new c-products 30 rnd and 10 round both worked flawlessly. total price with magazines so far around $265.
The target was shot after initial sight in, this is a no bias 4 group target shot right in a row, I blew the last one. Each square is 1". The tulammp had 5 failures to fire out of 20 the old 20 year old barnual had no such issues. I have an extended firing pin coming ($14 shipped).
The upper receiver has many thousands of rounds through it and shows almost no wear at all!