S&w Mp-15???

[sloppyjoe]

SO I have a very good friend of mine who picked one of these up. The ? I have is. It is chambered 5.56, but the guy @ Gander Mnt. said that he could shoot 223, why when we tried this did it not work? It would shoot the round and sometimes spit the shell but it would not reload the next.... I put the 5.56 through it and not issues, why is this. By the by I told him not to shoot anymore of the 223 until I asked my People . So help me out here. Thanks JOE>

P.S. if he does not quit calling Mags, Clips I am going to start calling him 2pac.

[RobFMJ]

The guy at Gander mountain was right. Any AR15 should have no trouble chambering/firing/cycling .223. I'd say look at the magazine first, and if that aint the problem, call up S&W. While I disagree with their rebadging of other company's AR's, Smith has damn good customer service.

[Lazarus]

Originally Posted by RobFMJ

The guy at Gander mountain was right. Any AR15 should have no trouble chambering/firing/cycling .223. I'd say look at the magazine first, and if that aint the problem, call up S&W. While I disagree with their rebadging of other company's AR's, Smith has damn good customer service.

+1. My Stag is chambered in .223 which is a slightly smaller cartridge, although I forget which part. Anyways that wouldnt cause it not to feed the next round. Sounds like a mag issue.

[RobFMJ]

Here, took this off http://www.ammo-oracle.com/ for ya:

Q. What is the difference between 5.56×45mm and .223 Remington ammo?

In the 1950's, the US military adopted the metric system of measurement and uses metric measurements to describe ammo. However, the US commercial ammo market typically used the English "caliber" measurements when describing ammo. "Caliber" is a shorthand way of saying "hundredths (or thousandths) of an inch." For example, a fifty caliber projectile is approximately fifty one-hundredths (.50) of an inch and a 357 caliber projectile is approximately three-hundred and fifty-seven thousandths (.357) of an inch. Dimensionally, 5.56 and .223 ammo are identical, though military 5.56 ammo is typically loaded to higher pressures and velocities than commercial ammo and may, in guns with extremely tight "match" .223 chambers, be unsafe to fire.

The chambers for .223 and 5.56 weapons are not the same either. Though the AR15 design provides an extremely strong action, high pressure signs on the brass and primers, extraction failures and cycling problems may be seen when firing hot 5.56 ammo in .223-chambered rifles. Military M16s and AR15s from Colt, Bushmaster, FN, DPMS, and some others, have the M16-spec chamber and should have no trouble firing hot 5.56 ammunition.

Military M16s have slightly more headspace and have a longer throat area, compared to the SAAMI .223 chamber spec, which was originally designed for bolt-action rifles. Commercial SAAMI-specification .223 chambers have a much shorter throat or leade and less freebore than the military chamber. Shooting 5.56 Mil-Spec ammo in a SAAMI-specification chamber can increase pressure dramatically, up to an additional 15,000 psi or more.

The military chamber is often referred to as a "5.56 NATO" chamber, as that is what is usually stamped on military barrels. Some commercial AR manufacturers use the tighter ".223" (i.e., SAAMI-spec and often labeled ".223" or ".223 Remington") chamber, which provides for increased accuracy but, in self-loading rifles, less cycling reliability, especially with hot-loaded military ammo. A few AR manufacturers use an in-between chamber spec, such as the Wylde chamber. Many mis-mark their barrels too, which further complicates things. You can generally tell what sort of chamber you are dealing with by the markings, if any, on the barrel, but always check with the manufacturer to be sure.

In a nutshell, its fine to fire .223 ammo in a 5.56mm chambered barrel, but it is NOT ok to fire 5.56mm loaded ammo in a .223 barrel.

[FATSEXY]

People say that S&W's M&P15 is a parts gun or another gun rebranded, and RobFMJ, you said the same, could you guys tell who makes S&W's gun? I've never read that anywhere and I'm wondering.

[ScottyPotty]

Originally Posted by FATSEXY

People say that S&W's M&P15 is a parts gun or another gun rebranded, and RobFMJ, you said the same, could you guys tell who makes S&W's gun? I've never read that anywhere and I'm wondering.

S&W used to use stag lowers with the S&W logo. They do not do this any more.

[brian40]

Originally Posted by ScottyPotty

S&W used to use stag lowers with the S&W logo. They do not do this any more.

Since when? The S&W's rifles have always been made by CMT as far as I know. Stag is the retail arm of CMT.

Who makes them now?

[unleashed]

well i got a S&W ar15 for xmas an have not shot it yet
but i bought a 1000 rounds of 223 i am going to range in the morning and i hope i have no issuies or else i will be on the phone i am still waiting on
my magz
to come in the mail
,,,i will have a range report and some pics

[sloppyjoe]

Nay recommendations on a good mag for this gun??? Thanks JOE>

P.s. I will relay all of this info to him, and hopefully get him in here(the forums) so he can ask his own ?'s.

[nikon777]

Originally Posted by sloppyjoe

Nay recommendations on a good mag for this gun??? Thanks JOE>

Id say pmags, but there have been issues with S&W with those also. So go with NHMTG.