Due to this being a high demand item there may be a 2-7 day lead time on shipping at times. RMP™ Muzzle Cup Kit The RMP™ Muzzle Cup Kit is everything you need to create a solid mounting point for your Muzzle on any RMP™. It comes with two backer plates and an L-Bracket which create the shelf that the Muzzle Cup will attach to. The L-Bracket has 4 tapped holes spaced at 1/2" increments to allow you to get the muzzle the correct spacing off of the RMP™. The rubber coated steel cup secures to the Muzzle Cup L-Bracket using the included machine screw and 5/32" Hex Key. The Muzzle cup comes in two sizes, Standard and XL. The standard will accept 12 gauge and smaller barrels (with a notch cut for the front site post) as well as almost any standard rifle barrel or flash hider. For larger flash hiders and Suppressors, use the "XL" size. Package Contents: [Standard Cup] QTY 1 - Standard Muzzle Cup QTY 2 - AN RMP Backer Plates™ QTY 1 - AN Muzzle Cup L-Bracket QTY 2 - 1/4"-20 x 1/2" Socket Button Head, Stainless Steel - Black Oxide Finish QTY 1 - 1/4"-20 x 3/8" Socket Button Head, Stainless Steel - Black Oxide Finish QTY 1 - 5/32'' Hex Key Package Contents: [XL Cup] QTY 1 - XL Muzzle Cup QTY 2 - AN RMP Backer Plates™ QTY 1 - AN Muzzle Cup L-Bracket QTY 2 - 1/4"-20 x 1/2" Socket Button Head, Stainless Steel - Black Oxide Finish QTY 1 - 1/4"-20 x 3/8" Socket Button Head, Stainless Steel - Black Oxide Finish QTY 1 - 5/32'' Hex Key Compatibility: [Standard Cup] INNER DIAMETER 0.98" | 24.86mm -Any Barrel up to 0.98" outer diameter -12 Gauge Shotgun (cut out for front site post) -Hunting Rifles -AR-15 -AR-10 -AK-47 Compatibility: [XL Cup] INNER DIAMETER 1.875" | 47.69mm -Weapons with Flash Hider up to 1.875" outer diameter -Weapons with Suppressor up to 1.875" outer diameter Specifications: [Standard Cup] WIDTH 1.7" | 45.60mm HEIGHT 3.2" | 82.58 mm THICKNESS 2.0" | 51.68 mm WEIGHT 6.91 ounces | 196 grams MATERIAL Aluminum RMP Backer Plates™/ L-Bracket and Steel Muzzle Cup BRAND Grey Man Tactical™ SKU 000392 UPC N/A MOLLE SPACES 3 X 2 Specifications: [XL Cup] WIDTH 2.6" | 67.50 mm HEIGHT 3.2" | 82.58 mm THICKNESS 2.5" | 64.49 mm WEIGHT 11.99 ounces | 340 grams MATERIAL Aluminum RMP Backer Plates™/ L-Bracket and Steel Muzzle Cup BRAND Grey Man Tactical™ SKU 000394 UPC N/A MOLLE SPACES 3 X 2