Ive got 2 spartans one sits on my .223 and is awesome...the other is a real sl%t and gets heaps of barrels shoved up her..it had a round go out end not quite square early on in life so possibly (ok definately) not as quiet as it should be a 10mm out hole is never going to be as good as an 8mm one..that goes on my .270 or the .308 or the 7.62x39mm it does reduce sound a hell of alot...even on the poohseventy my ears dont ring and recoil reduction is good....both are over barrel..... also own a DPT that is purely for the .270 cant really say notice much difference in weight or noise and strange thing is rifle seems to balance better with spartan as weight is back closer to stock even though its about 3/4" longer overall.
keep it long I say,just take off enough to tidy up crown and rethread it...you can always spend lessthan $100 and redo it later but you cant add it back on. putting insulation tape over end of can keeps the crap out and SEEMS to help make first shot quieter too.
take all your spare cash with you when you go to collect finished rifle...there are heaps of well priced goodies in the wee shop.
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