A few days ago, Stag introduced a series of 9mm carbines that have some similarities to the Colt workhorse of DOE and police fame, and have a few new features. The Model 9 is available in right or left-handed, and in Tactical or (we guess, to steal from David Ogilvy, “diffident about tactical”) regular trim. This is a regular, RH-oriented Stag Model 9:
That’s the factory photo. It does embiggen with a click. The Stag 9 upper is much like the Colt’s, with no ejector port door and a polymer ejected-case bumper, as is the blowback, non-locking bolt/carrier unit. Unlike Colt, which uses an insert in an ordinary AR lower, the Stag has a dedicated lower, that’s broached (or more likely, wire-EDM’d) only for the 9mm mag, same mag as Colt’s. Here’s the Tactical version in left hand, with the mag in:
The rounded rectangular protrusion on the upper forging that, on a locked-bolt rifle, gives the cam pin a place to rest, serves no purpose on the 9mm AR, but it’s there because the gun is only economical because the same forging is used for the 9mm upper, and the one for other, more usual AR calibers.
As you can see, “tactical” gets you a free-floating handguard and pop-up sights. Both handguards take Diamondhead rails; the non-”tactical” version has a conventional “gas block” although it taps no gas from the non-ported barrel, and it comes without sights (or, in marketing-speak, “optics ready.”
On the principle than only a fool invents a new feed system when he doesn’t have to, the Colt mag is based on the venerable Uzi mag, and is available in 20- and 32-round lengths (as opposed to the Uzi’s 25 and 32). Of course, no one has tried Uzi mags in the introduced-last-week Stag 9mm yet, but people have had mixed, mostly bad, luck with Uzi mags in Colts, and people have had all kinds of bad luck with just about everything in non-Colt 9mm ARs — making a 9mm AR that runs is harder than it looks. Making a 9mm that runs on a wide range of ammo is really hard, because the recoil impulse varies so widely, and any blowback system is optimized for a specific recoil impulse. That was one advantage of HK’s old MP5 and its roller-locking system. Even though the MP5 could be fussy about hollow points, it didn’t sweat bullet weight and powder charge changes too much.
A 9mm AR is always a bit homely, if not deformed, looking, but they shouldn’t be dismissed out of hand. The pistol caliber submachine gun or carbine has always had a niche, and that niche is, mostly, indoors. So the optimum 9mm AR (assuming, ceteris paribus, the thing works) might actually be a small SMG or SBR, much like the special Colt Model 633 that was used by DOE. The 633 had a controllable rate of fire by using a special hydraulic buffer, different from that in other Colt 9mms. Stag’s press release has no details of their 9mm buffer, except that it is different from that in their other rifles. At the reasonable, sub-$1k list of the basic 9mm, a hydraulic buffer is unlikely.
The 9mm SMG had a run in the conventional military from 1918 to circa 1965-70, when assault rifles replaced most of them. It had a second lease on life in the 70s and 80s as a special operations CQB weapon. It was replaced by the 5.56mm carbine in military special operations for specific reasons, having to do with the 9mm’s range envelope. There have always been problems transitioning from the 9mm’s close-combat sweet spot to engage targets further out. A specific combat operation in Grenada in 1982 where American SOF found themselves outranged by meatheads with assault rifles was, if not the cause, the catalyst for the change.
But the police don’t have that reason to move to the 5.56 and they’re doing it, as far as we can tell, both because reliable 5.56 carbines are far easier to come by, and, perhaps, because of a certain “operator” cachet. They may be making an error. A 115 grain 9mm JHP will still overpenetrate in an indoor setting, but not like an M855A1 round will, and the 9mm (with modern defensive ammo) will do a decent job of putting an armed and hostile Wealth Redistribution Engineer down. It’s a tough call for the cops, though, because their rifle-engagement callouts are so rare, you can’t really say what the “usual” one is like. You can make some statistical inferences, but every new call is a roll of the dice, and it may turn out the capability needed is the barrier-blind penetration that a 9mm leaves on the table.
Having a 9 with the same manual of arms of the 5.56 is a plus. The Stag and Colt keep most of the key muscle memory points the same as on the rifle-cartridge AR. Even the very different, non-AR SIG MPX sought this same positive training transfer by keeping key fingerings (trigger, safety, mag release) identical to the AR.
If the Stag runs reliably, and there’s no reason to expect it not to, it gives 9mm carbine users another option besides trying to wring another year out of vintage and weary MP5s, going to the SIG MPX, going Colt or ditching the pistol round for 5.56. And on stuff like this, it’s good to have choices.
The technical stuff rom the Press Release:
Both the Model 9 & 9T series boast a 1/10 twist 16” heavy barrel, blowback action, a 6-position adjustable buttstock, and as always they are available in right & left hand configurations. The safety, charging handle, and magazine release function the same as any AR-15. However we have designed the actions of the rifles from the ground up. The rifles accept standard Colt style 9mm AR magazines which insert into the integrated magazine well in the lower receiver. The integrated magazine well won’t come loose or have feeding issues accompanied with drop in magazine blocks. Differences from a standard AR-15 can also be found in the lower receiver with a specially designed hammer, magazine catch, and buffer. In the Upper half, the bolt and carrier are one piece with a modified ejection port cover and brass deflector.
The Model 9 and 9T have different configurations. The Model 9 has a railed gas block and drop in Diamondhead VRS-T modular handguard with no sights. The Model 9T is the tactical version with a free floating 13.5” Diamondhead VRS-T modular handguard and aluminum Diamondhead flip up sights for faster target acquisitions. Both rifles will accept the Diamondhead rail sections for extreme customization.
For more information, and for the specs on each model, Read The Whole Thing™.