15/01/2020 · Converting a 5.56 MCX Rattler to 300 BO. This is a discussion on Converting a 5.56 MCX Rattler to 300 BO within the SIG Sauer Rifles forums, part of the SIG Sauer Forum category; Anyone know what I need to buy to do this conversion? I can't find a 300 BO conversion kit for the rattler on the Sig. 28/12/2018 · New Rattler- Should have done my homework. This is a discussion on New Rattler- Should have done my homework. within the SIG Sauer Rifles forums, part of the SIG Sauer Forum category; Hello Gentlemen, I have read some great information about Sig rifles on this forum Thanks to all the contributors that make this forum great. Picked.

U.S. Special Operations Command intends to transform some of its standard-issue M4 carbines into Sig Sauer MCX Rattler personal defense weapons, apparently satisfying the command’s year-long. It features a barrel an 292 mm 11.5 in barrel for the 5.56×45mm NATO calibre, and a 229 mm 9 in barrel for the.300 AAC Blackout calibre. SIG MCX RATTLER. The SIG MCX RATTLER features a 140 mm 5.5 in barrel and comes either in short-barreled configuration or with a SIG Sauer PCB pistol pivoting contour folding brace. Now we have the.300 Blackout cartridge, which has boosted SBR performance by bringing a hard-hitting,.30-­caliber projectile powered by pistol powder. Even with the.300 Blackout, there still remained the challenge of making the AR platform's gas system reliable in ever-­shrinking packages. SIG Sauer's Rattler has overcome this challenge. The Sig Sauer Caliber X-Change Kit allows for the conversion of your AR-15 to the Sig Sauer MCX Rattler. Sig Sauer offers upper assemblies and caliber exchange kits in various barrel lengths. All NFA rules apply to installation of these upper assemblies to lower receivers and caliber exchange kits.

Sig Sauer Rifles. World renowned and the choice for many of the premier global military, law enforcement and commercial users. sells a wide variety of Sig Sauer handguns, rifles, suppressors, scopes,. 5.5".300 Blackout. 2 Reviews Out of stock. Regular Price: $1,579.99. Special Price $1,329.99. Add to Wishlist; Sig Sauer MCX Rattler Conversion Kit - 5.5".300 Blackout Add to Cart. Regular Price: $499.99. Special Price $419.99.