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sig sauer pm400

Sig Sauer Pm400 - SIG Sauer has just released a new iteration of their TREAD line in the 5.56 AR, this time in an 11.5″ pistol configuration. TFB had the opportunity to get our hands on one of these pistols for a quick review.

The M400 TREAD pistol is an optically finished aluminum framed pistol. The TREAD pistol is equipped with an 11.5″ nitride coated barrel, cold forged hammer, and free floating M-LOK handguard, single stage polished/hardened trigger, ambidextrous controls, Shockwave Blade 2.0 Industry brace KAK, gas length carbine system, and is available in 5.56 NATO. Existing TREAD accessories are compatible with the TREAD M400 pistol, except for the 13" and 15" long M-LOK handguards, a lightweight handguard will be included for the TREAD pistol available in 10.5" length. TREAD accessories include: 3-chamber compensator; ambidextrous charging handle made of aircraft grade aluminum with double roll pin design; ROMEO5 optic with 2MOA dot and ten illumination settings, MOTAC, and 50k hour battery life; front and rear flip-up sights that are easy to install, adjustable, and quick to deploy; M-LOK front sight adapter with height co -proof made of lightweight aluminum; multiple configurations of M-LOK grip kits made of high-strength polymer; and factory upgraded 2-stage trigger. M400 TREAD Pistol Specifications: Overall Length: 27" Barrel Length : 11.5" Weight (including magazine): 6 lbs Height: 7.5" Width: 2.5" Deep dh barrel: 1:7"   MSRP: $951.00 M400 TREAD Price Accessories MSRP- Specs ): LOK 10.5" handguard $149.00 ROMEO5 Optic $179.00 adjustable riser $149.00 2-stage match trigger $119.00 ambidextrous charge handle $49.00 3-chamber compensation $49.00 M-LOK TREK090 TR  retail line available. TREAD accessories and TREAD-branded apparel at sigsauer.com Get Social: follow SIG SAUER on Facebook, Twitter, Instagram, and YouTube for the latest news, product releases, events, and updates. First impressions:

Sig Sauer Pm400

Sig Sauer Pm400

The M400 TREAD pistol goes in a cardboard box, with a Magpul PMAG 30 round. When I took it out of the box, I appreciated the squarish M-Lok handguard. No cheesy rap here like on my old P516 pistol. Above the break is a forged aluminum copper marker, versus the Cerro marker on my old P516. (Author's note: my old gun was previously referred to as an M400 by mistake - some readers were kind enough to point out that the old piston guns were all 516)

Selbstladebüchse Sig Sauer Sigm400 Tread Pistol 11.5″, Kaliber 5.56 Nato

Below are some differences as well. The TREAD pistol features an adjustable KAK Shockwave Blade brace versus the non-adjustable SigTac brace on the old P516. Pull the trigger in one step hard coat the trigger has a dry break without creep. The recovery was positive and brief. The trigger is on the heavier side, however, averaging at 6 lb, 4oz. The total weight of the pistol was 6lb, 4.7oz including the Romeo5 RDS mount. Without the Romeo5, it is a full pound lighter than my old P516 pistol, a huge improvement in weight.

They retained the same ambidextrous magazine release from the old pistols, along with the ambidextrous rear QD stud hole and ambidextrous selector switch. The right side of the compartment switch is conveniently recessed so you don't dig into a right shooter's hand. The ambidextrous QD posts prevent the use of some retractable arms such as the Maxim Defense CQB, as they are out of the way.

I have mixed feelings about the TREAD grip panels attached to the handguard. On the one hand, they gave the firearm a more advanced purchase. On the other hand, I found the yellow background color to be rather bright and boring. The upper to lower receiver fit was rather good, further supported by a wedge in the rear of the lower receiver.

I took the TREAD pistol out of the range with 200 rounds of SIG Elite 55gr FMJ graciously provided by SIG, as well as other light balls, M855, and heavy game ammo. The rapid fire results at 25 yards were good. The pistol ran through a Magpul 60 round drum with no issues and showed just fine. This author was able to keep everything in the IPSC range on the torso and head while shooting in a variety of dynamic settings. Romeo5 RDS rose to the appropriate height and was intuitive and easy to use.

Sig Sauer M400 Sdi Switchblade 5.56x45mm Nato Semi Auto 11.5\

Move at 50 yards, 11.5″: CHF barrel posted good results. I shoot first for accuracy with a front and rear rest. The best 5-shot group with FMJ 55gr SIG ammo was .32″, but the average was .81″. Tried again with a hot smoking barrel (after 300 rounds of rapid fire) the groups opened up to 1.98″. Accurate accuracy with thin barrel after many rounds.

Moving from 100y and beyond, I began to see the limitations of the TREAD pistol. Groups average about 2″ with the following ammunition:

Best performance at 100y from 75gr HP Black Hills, comes in 1.85″. These accuracy results are very competitive with other AR pistols in this price range. But trying to make other hits at 300y was very difficult. This is not a short barreled AR that someone can hit on 500y steel like other platforms I have used.

Sig Sauer Pm400

Distance was measured by Labrador with loads of 55gr and 77gr, 10 shots each for an average representation of light and heavy loads.

Item Relisted! Fs Sig Sauer M400 5.56mm Fde Pistol With Sb15 Stabilizing Brace, Bnib Not Tread

SIG Sauer 55gr FMJ average MV 2586fps, V @ 50y 2491fps (V @ 100 missing due to chronograph being difficult to track projectiles at this range)

The M400 TREAD pistol was shot mostly in hot, dusty conditions. Right out of the box with no additional cleaning or lubrication, it performed flawlessly in 600 rounds fired through several types of magazines. These include Gen 1, 2, and 3 PMAGs, a D60 drum, magazines from HK, C Products, Brownells and even an old Colt 20 Rounder from the 1970s.

The pistol was fired sideways, upside down, supported and unsupported with hiccups. It moved to 300 just as fast as I could pull the trigger and change magazines. Even though the barrel was smoking and the hand guard was too hot to handle without gloves, it didn't work properly. I have seen AR platform guns that cost 3-4 times that much.

Objectively, the SIG Sauer M400 TREAD Pistol was 100% reliable during TFB's brief evaluation period. The accuracy of the "pistol" between 50y was very good, even after the barrel was smoking hot. It's a pack lighter than the old piston-driven P516 pistol, and handling reflects the reduction in weight.

Sig Sauer M400 Tread (5.56mm) Pistol With 11.5\

Subjectively, this author found the TREAD pistol to be a reasonable value for the price point. Its strongest points are reliability, compactness and light weight. With a short barrel, you have to be very careful about ammunition selection, though. If someone is considering this pistol, it might be worth checking out something like the Black Hill 5.56 50gr TSX or Hornady's 55gr FTX. Although there are more accurate AR pistol platforms out there, they usually cost 2-3 times as much. The M400 TREAD pistol is a great choice for a low cost entry into the AR pistol world for a suitable truck or shotgun.

Even though the trigger is a little on the heavy side and accuracy decreases at longer ranges, it would be a decent truck gun for those who weren't inclined to assemble their own pistols. This author believes that with the M400 TREAD, SIG Sauer has given serious competition to the lower priced SAINT series of pistols.

Always passionate about firearms, Rusty S. has experience in gunsmithing, gun sales, hunting, competitive shooting, range building, as an IDPA certified range safety officer and as a certified instructor. He received military, police, and private firearms training. Editor at Outdoorhub.com

Sig Sauer Pm400

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