Sig Sauer’s Suppressed Upper Reciever (SUR) in .300Blk is a complete MCX upper with bolt and charging handle included. Compatible with MCX and MCX VIRTUS systems, this upper is also compatible with most standard M4/AR-15 lower recievers. Sporting a 9 inch 300BLK barrel with a pinned and welded titanium suppressor, this upper comes in at a “barrel length” of 16.375″ meaning that it does not require a SBR lower. This means that the SUR300 is a fantastic way to upgrade that old lower receiver you have laying around with the MCX VIRTUS piston operating system and a 2 position gas valve!
To that end, this upper ships with a MATCHLITE DUO two-stage match-grade drop in trigger as well as an AR 1913 receiver adapter for use with a folding stock. You really can’t ask for a better package deal to upgrade an existing AR lower receiver!
Lastly, the silencer included with this upper receiver is proprietary to this system and is optimized for use on .300BLK.
Receiver Material: 7075 Aluminum
Receiver Finish: Mil-Spec Type III Hard-Coat Anodize
Barrel Material: Cold Hammer-Forged Carbon Steel
Barrel Finish: Nitride
Barrel Length: 9″
Barrel Twist: 1:5in
Suppressor Material: Titanium
Suppressor Finish: Black DLC
Mount: Pinned and Welded
What’s In The Box?
QD Sling Adapter
MATCHLITE DUO Trigger
M4/AR15 1913 Receiver Adapter and Folding Stock Adapter