PRE-ORDER Guidance
As you are probably aware, recent updates to ATF's eForm approval process has resulted in drastically improved turnaround times. While this is certainly a positive change, it has also had a predictable impact on suppressor inventory across the industry.
With that in mind, if you know you want a particular suppressor (or three) and it isn't in stock, your best bet is to place a "PRE-ORDER" so that we can purchase your desired suppressor the moment it becomes available from our distributors. If you wait until it shows in-stock on the website, you might miss your opportunity. PRE-ORDER helps us seek out and purchase what you are looking for. This is true whether you buy from us or someone else.
Thank you for considering Longbow Arms, we hope to earn your business.

M4SD-L
FEATURES
- Laser-welded, tubeless design
- Rapid and versatile GATE-LOK™ mounting system
- Compatible with GATE-LOK™ or A2 Nato Spec Compensators
- 17-4 H900 heat-treated stainless steel
- Patent-pending flash reducing and flow optimized end cap
- ECO-FLOW™ baffle system for improved performance and shooting experience
- GATE-LOK™ Hammer Comp 1/2x28 5.56mm (.22 cal) muzzle device included
- ¾” wrench flats on muzzle devices
- Suppressor body H900 heat treated and Cerakoted
- Perpetual™ Lifetime Warranty
WHAT'S IN THE BOX?
- M4SD-L Suppressor
- GATE-LOK™ Hammer Comp 5.56mm 1/2x28
- Branded Griffin pouch
- Manual
MOUNTING OPTIONS AVAILABLE :
Silencer interface was designed to fit the USGI A2 government contract compliant muzzle devices. We cannot guarantee fitment with an A2 style compensator due to the broad tolerance range of both import and domestic devices from various brands. For guaranteed fitment, we recommend the purchase of a Griffin GATE-LOK™ mount. This item ships with a GATE-LOK™ Hammer Comp for use immediately out of the box.
CALIBER RATING :
The M4SD-L 5.56mm suppressor is rated up to .22-250 REM.
M4SD-L Suppressors do not have minimum barrel length restrictions or constraints for rifle calibers. While longer barrels promote longer service life, there are no barrel length restrictions with this suppressor!
Inventory and Ordering Guidance
Longbow Arms attempts to keep popular items in stock, however, if you want something not listed on the site, please reach out to us so we can discuss ordering that item. Under normal conditions, non-NFA items can be ordered and received within 5-10 business days.
For NFA items, Dealer to Dealer and Manufacturer to Dealer transfers are subject to eForm 3 approval times which are currently running 7-14 days.