AR-15 Rep said:
I do not believe stag makes parts for most AR rifles.
Stag's parent company, CMT, does.
rangerruck said:
I'm with W.E.G. , get a rifle with as many forged, milled , milspec, milstandard made parts as possible.
How can you recommend a rifle when the original poster did not say what his needs are? If he is hunting midsize or large game, there are better choices than .223. If he's varmint hunting, a mil-spec 1/7" is not the best choice for light, fast bullets. If he's shooting matches, mil-spec is a bad idea too. If his goal is accuracy, mil-spec is not the way to go. And even if he wants a fighting carbine or rifle, mil-spec is not always the best. PMAGs and CTR stocks are not mil-spec but are some of the hottest parts for AR-15s right now. For a DI AR-15, most folks will want mil-spec upper and lower receivers. And even that is not 100% true since finishes vary by manufacturer and not all are "mil-spec."
As for the chart... It's biased, out of date, and useless. "The chart" is BS. For the BCG section, just buy a Bravo Company BCG and you'll get all of that stuff for $130. It is MPI'd, shot peened, is properly staked, has the O-ring and uprgraded extractor spring, etc etc. Skip or sell the bolt in your "peon" rifle to recoup part/most of the cost.
The M16 carrier is moot. Unless you have a full-auto gun, they aren't necessary for a reliable rifle.
Mil-spec barrel steel? This is the 4140 and 4150 nonsense. If you shoot full-auto, you might need mil-spec steel. Moot again. Thousands of rifles have 4140 and 4150 barrels. Neither are melting, bending, or otherwise getting fubared.
MPI and HPT barrel? I suppose it's good to have, but I've never heard evidence that MPI and HPT barrels fail at a lower rate than those that aren't MPI and HPT. Additionally, I'm not sure how old the chart is, but my wife's Bushmaster upper has an MPI barrel (at least it is stamped as such).
Chrome chamber and bore? Good but not essential for maintenance and I've heard that the chrome chamber aids in extraction. A chrome bore potentially harms accuracy but is easier to clean.
Rifling twist plays no part in reliability. Pick your twist based on your ammo needs. Can you afford to feed a 1/7" twist with proper heavy OTM ammo? If you'll be shooting lots of 55gr Wolf and Rem UMC, pretty much any barrel will work.
A 5.56 chamber will matter if you are shooting 5.56NATO-pressure loads. Larger chambers aid in reliability but can hurt accuracy. There is a compromise there.
M4 feedramps seemed to have faded from the "must-have" list. Many manufacturers offer them, and I've never heard of them hurting anything. There are literally tens of thousands of rifles and carbines that do not have M4 feedramps that are as reliable as the sun.
The F-marked FSB matters for flat tops. However, not all bases are marked and not all marked bases have the correct post. Either way, a cheap, proper-height sight post will fix this if you get the wrong one. Plus manufacturers can botch it:
http://www.jobrelatedstuff.com/forums/topic.html?b=3&f=18&t=371192
Mil-spec receiver extension is a non-issue and does not effect reliability. They do increase choices if you wish to install an after-market stock.
H Buffers are not necessary in most rifles. Some folks like them, some folks don't. Some folks even run 9mm buffers in .223 carbines. A common 14.5", 16", or 20" rifle shouldn't need fancy buffers to run correctly if the rest of the rifle is stock.
Parkerizing under the FSB should not affect reliability either. I suppose if you plan on altering the rifle and removing the OEM FSB, this may become an issue.
The idea that Colts and LMTs are the best AR-15 style rifles is about as ridiculous as the idea that Glocks are perfection (and I own a Glock).
Buy a rifle or carbine from a reputable manufacturer, use quality magazines and quality ammo and you'll be fine. Or, build it yourself. AIMSurplus.com has Superior lowers for $80 and Doublestar lowers for $100. Spikes Tactical is running a group buy on Arfcom for their lowers at $100 (IIRC).