We\u2019re truly living in the \u201csalad days\u201d of suppressor<\/a> ownership, with competition keeping prices relatively low and the (immoral, unconstitutional) NFA approval process moving as fast as ever. In fact the subject of today\u2019s review, the Griffin Armament M4SD-L, was approved in about 18 hours once the f\u2019ing ATF had their hands on the paperwork. Governmental gripes aside, let\u2019s look at the M4SD-L, how it performs and what makes it worth a recommendation.<\/p>\n I\u2019d argue that there\u2019s four main considerations when we\u2019re looking at a modern suppressor purchase. Physical form (which includes both size and materials used), backpressure, mounting system and overall suppression performance. Let\u2019s tackle these as they relate to the Griffin Armament M4SD-L one at a time. Price is so dependent on each customer\u2019s situation that I leave whether or not a can is worth it to you, the reader. I\u2019m covering how it works, you decide what you\u2019re willing to spend.<\/p>\n It is 6.5 inches long and 14.5 ounces of steel. The M4SD-L isn\u2019t a micro can, nor is it an overkill can for max suppression. I\u2019d say the M4SD-L falls in the \u201cmid-size\u201d category, and toward the smaller end of that genre to boot. This is a fairly short suppressor, but it is extremely solid, which is par for the \u201ctubeless, laser-welded\u201d crowd. Not as light as a titanium can, but lighter than many other suppressors in this length, diameter and price range. Going tubeless helps save weight, at the cost of increased welding time\/expense.<\/p>\n This is somewhat of a subjective category, but comparison helps us out here. Griffin Armament uses Eco-Flow baffles on the M4SD-L, which are designed to give better suppression than total \u201cflow through\u201d suppressors, yet better backpressure reduction than traditional baffles. Here\u2019s a brief and informal description by Austin, owner of Griffin Armament, that took place in a discussion on AR15.com regarding Eco-Flow baffles:<\/p>\n We have a pair of patents in process on the cans. \u00a0They use basal ports on the periphery of the baffles to create streamwise vorticity, sending a plurality of high velocity streams of gas into contact with other flow streams. \u00a0The turbulence created by the extra flow through gas reduces the velocity of gas and diminishes energy, lowering sound, while improving flow through the system.<\/p>\n<\/blockquote>\n So how well does it work? Well, pretty much exactly as I\u2019d expected from the design statement. While the Griffin Armament M4SD-L has more backpressure than the Huxwrx Flow 5.56 Ti I shot alongside it, the M4SD-L is a definite improvement over older designs with traditional baffles, like AAC\u2019s M42000, Suppressed Armament System\u2019s Reaper Ti and even the Griffin Armament M4SDII. There\u2019s not a lot of gas coming back to the shooter, having tested this can on a couple of different hosts.<\/p>\n It\u2019s worth noting that Griffin Armament also designs their MKII AR-15<\/a> series to further mitigate gas to the shooter as well.<\/p>\n Griffin Armament is using their Gate-Lok mounting system, which will be immediately familiar to anyone who used KAC\u2019s M110 or QDSS NT4 suppressors with their Gate Latch mount, which pretty clearly influenced the Gate-Lok design.<\/p>\n The suppressor side of the mounting system has the gate, which lifts out of the suppressor to release it, or depresses to engage the mount. The gate is held in place by a spring plate, which needs to be pushed out of the way (rearwards) to release the gate.<\/p>\n On the rifle side, the Gate-Lok interfaces with Griffin Armament\u2019s Gate-Lok series of flash hiders and compensators, as well as standard USGI A2 flash hiders. That last item needs a little more clarification though. Not all A2 flash hiders a built totally to spec, since some manufacturers seem to figure they\u2019re only used as flash hiders. This is why some of these A2s won\u2019t properly mount a blank firing adaptor either.<\/p>\n While you\u2019re free to check out which various A2s other M4SD-L owners have had success with (Del-Ton, according to a few Reddit users), Griffin Armament also includes a Hammer Comp<\/a> with the suppressor for use on your 1\/2\u00d728 threaded barrel.<\/p>\n My first couple range days with the M4SD-L and the Gate-Lok mount were a touch frustrating. The tolerances were pretty tight between the can and mount, so there was some wiggling and twisting to be done. Once I\u2019d mounted and removed the can about 25 to 30 times, the whole system eased up considerably.<\/p>\n There was also a small learning curve on how exactly to arrange your hand when removing the can to keep it a one-handed task. I started out certain I was screwing something up, and now everything\u2019s running smoothly. This has turned into the fast, easy mounting system that\u2019s advertised, with less wear\/failure points than a latch system (AAC 51-, 90-tooth), and no chance of carbon lock twisting off your mount inside your can (SAS TOMB). That\u2019s especially handy when as a reviewer, I have to swap mounts onto various rifles often and don\u2019t use threadlocker on a mount that\u2019s only going on the rifle for a few hours.<\/p>\n![\"Griffin](\"https:\/\/cdn0.thetruthaboutguns.com\/wp-content\/uploads\/2025\/01\/12.jpg\")
Griffin Armament M4SD-L Tech Specs and Features<\/h2>\n
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Physical Form<\/h2>\n
Backpressure<\/h2>\n
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Mounting System:<\/h2>\n
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