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The Griffin Armament M4SD family is Griffin's flagship line of 5.56mm quick-detach rifle suppressors. All three models use the GATE-LOK™ SDQD mounting interface — a wear-free, ratchet-free system compatible with USGI A2 spec compensators and Griffin's proprietary GATE-LOK muzzle devices, precision-ground to ten-thousandths of an inch for minimal, repeatable POI shift. All are constructed from 17-4 PH stainless steel and are full-auto rated. Mounts accept standard NATO A2 flash hiders with no proprietary mount required on the host.

GATE-LOK™ SDQD mounting: wear-free, ratchet-free QD system; mounts natively on standard A2 NATO flash hiders — no proprietary host modifications required

M4SD II: billet-machined 17-4 SS chassis (tube body) — the heart of the suppressor is stronger than any tube-based design; integrated flash suppressor front cap reduces flash signature

M4SD-L: tubeless laser-welded construction for reduced weight without sacrificing durability

M4SD-K (MOD 5): ECO-FLOW™ baffles minimize backpressure; full Inconel blast baffle for duty-use durability and short-sprint performance

All mounts precision-ground to ten-thousandths of an inch for minimal, repeatable POI shift

Founded 2005 by combat veteran sniper brothers — manufactured in Watertown, WI

- GATE-LOK™ SDQD mounting: wear-free, ratchet-free QD system; mounts natively on standard A2 NATO flash hiders — no proprietary host modifications required
- M4SD II: billet-machined 17-4 SS chassis (tube body) — the heart of the suppressor is stronger than any tube-based design; integrated flash suppressor front cap reduces flash signature
- M4SD-L: tubeless laser-welded construction for reduced weight without sacrificing durability
- M4SD-K (MOD 5): ECO-FLOW™ baffles minimize backpressure; full Inconel blast baffle for duty-use durability and short-sprint performance
- All mounts precision-ground to ten-thousandths of an inch for minimal, repeatable POI shift
- Founded 2005 by combat veteran sniper brothers — manufactured in Watertown, WI

Specs, features, and variants for the Griffin Armament M4SD family: M4SD II, M4SD-L, and M4SD-K 5.56mm quick-detach suppressors.

M4SD

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Model	Length	Weight	Sound Reduction	Notes
M4SD II	6.625"	17.1 oz	~32–35 dB	Flagship; billet 17-4 chassis; integrated flash suppressor front cap
M4SD-L	6.5"	14.5 oz	~32 dB	Tubeless laser-welded; lighter mid-size option
M4SD-K	5.9"	16.9 oz	~31 dB	Compact K-can; ECO-FLOW™ baffles; Inconel blast baffle (MOD 5)

Caliber	.22 / 5.56mm NATO (and sub-calibers)
Diameter	1.5"
Construction	17-4 PH stainless steel; high temp Cerakote finish
Mounting	GATE-LOK™ SDQD — compatible with USGI A2 spec compensators and Griffin GATE-LOK muzzle devices
Minimum Barrel Length	No restrictions (longer barrels promote longer service life)
Full Auto Rated	Yes

M4SD

Griffin Armament M4SD Series

Variants at a Glance

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