Washington State Clients !!!  We have an Expedited order process and ship option offered . Please Click on this link and add it to your firearm order >> Washington State Ship Option #3 << When added with your firearm order, the order will be upgraded to priority handling and Fedex Express Shipping. Your order can be placed no later than Tues June 25th 11:59pm. The FFL info must be chosen from our site or your dealers FFL emailed to us by 11:59pm June 25th. All orders would need to ship out on Wed June 26th in order to make it there before the July 1st cut off. Any incomplete orders with no FFLs will be canceled Wed morning 8am Eastern time and a cancellation fee charged.  

JMac Customs RRD-4C "30" (5/8 x 24) Muzzle brake/compensator

Price: $104.99
This item is in stock

                                                  JMac Customs RRD-4C "30" (5/8 x 24) Muzzle brake/compensator

The JMac Customs RRD-4C is a lightweight Muzzle Brake Compensator that not only reduces recoil by 20%. It also virtually eliminates muzzle rise and, reduces flash! This one of a kind combination device gives you control over your firearm like you've never had before while only adding 1.5" in length and 3.56 oz in weight! 


  • Material: Military Grade 17-4PH Stainless Steel
  • Length: OAL 2.1"(53.4mm), Added length 1.5" (38.1mm)
  • Weight: 3.56 oz, 101 grams
  • Finish: Matte Black Nitride
  • Caliber: .360" bore will work with 5.56, 5.45, 7.62x39, 300BLK, 6.5 credemore, .308/762 nato, 7.62x54r, 7mm, 7mm Mag, 300 win
  • Manufactured in the US and counts as 1 922r compliance part
  • 7.62 crush washer included


  • AR-10 type rifles
  • 300 BLK AR-15 type rifles
  • SCAR-17
  • Galil Ace Rifle and Pistol in x39 and .308
  • Bolt action rifles threaded in 5/8-24 with a bullet diameter no larger than .338
  • Keltec RFB
  • If you are unsure about compatibility with your firearm send an email to

Since the release of the original RRD-4, JMac Customs has been tweaking their designs to improve muzzle control and reduce weight. The RRD-4C has cut-outs on the top sides to allow gas to vent upwards in turn forcing the barrel downwards and virtually eliminating muzzle rise with an extremely low flash signature!

Reduces flash on barrels 11" and longer

Ships Via USPS Priority Mail for $7.95


Atlantic Firearms,llc
10337 Bunting Road
Bishopville, MD 21813
Office: (410) 352-5183
Voice: (410) 352-5183
Fax: (410) 352-3374