re: Do You Own An AR15 Rifle?
I have owned 3 different AR-15 rifles.
First was a Colt in 7.62x39, legal for deer hunting in places that do not allow .22 cal. My least favorite of the three, but it was deadly accurate with good ammo. Recoil is noticeably more than the standard 5.56 AR-15. Colt did not change the magazine to a proper AK type, so you were really stuck with one in the chamber and a couple in the mag for feed reliability. Worthless for self defense, so it got sold.
Next was a gun built from Olympic parts mostly. Heavy SS match 20" barrel 9" twist rate. Had to modify mag well to take Thermold and Orlite mags. Had A2 upper, so mounting a scope was iffy. But it was an accurate rifle and functioned very well. I acquired my third AR-15, which was a flat-top, which I liked better, so the gun got sold.
I still have the third AR-15. It's a real bastard gun, but my favorite by far. It has a HBAR Colt flat-top upper, 20" barrel with 9" twist rate. Colt doesn't make that barrel anymore, which is why I wouldn't buy a new Colt. M855/SS109 is deadly from this twist rate in 20" or longer. The lower is a Spike's Tactical that uses a DPMS lower parts kit installed by me. The buttstock assembly is a standard A2 that I had laying around. Don't remember who made it. Sling is green and from an FN FAL. Upper is Colt gray and lower is black. Scope mount is a Colt single piece quick detach made by B-Square with main body and caps that do not color match. Caps are black, but main body has definite purple tint. Chamber, bore and bolt carrier are hard chromed lined per mil-spec. You can run the gun indefinitely without cleaning if you put a couple of drops of good lube such as M-Pro 7 LPX in the two bolt carrier gas vent holes every couple hundred rounds and keep the fouling soft and oozing out. This gun is a shooter and shoots everything thing I feed it with decent to excellent accuracy. It NEVER has stoppage problems. I would like a nicer trigger, but the gun works and I'm not dinking with it.
I learned from a guy that rents full auto M16 rifles at his range that an AR-15 will run for thousands of rounds without cleaning if you keep them "wet" with lube. Black ooze was literally running out of the M16 rifle I rented, but it functioned flawlessly. The Thompson .45 ACP and Sten submachine gun that the other guys rented were having frequent stoppage problems.
Since you have to keep the gun "wet" with lube if you don't clean it often, not the best gun for blowing sand conditions. However, keeping the bolt cover closed when not firing solves that issue for the most part. In a damp environment where you can keep the bolt carrier liberally lubed, you can hardly ever clean the gun and it will work flawlessly.
I would advise against getting the uppers without a bolt port cover if you intend to be using it in the field under harsh conditions. Might work for a target rifle that is cleaned often. I've never had to use the forward assist to chamber a round, but the intent of that was to allow you to slowly and quietly close the bolt for reasons of stealth and then use the bolt assist to make sure the bolt carrier was fully forward and the bolt rotated fully and locked.
I have seen a couple of upper receivers where the bolt cam pin was left out during reassembly after cleaning. The gun blows up every time, so you better be careful about installing the bolt cam pin. I ALWAYS check for proper bolt rotation and lockup after dinking with the bolt carrier.