JMac - MDi-co

4C 14-1LH Slim

(15 Reviews)
Current Stock:
1.86 Ounces




(4) ports


(14)mmLH threads

(Slim) Slim design



RRD-4C "slim" muzzle brake compensator is:

23% slimmer (.885" vs. 1.150")
35% lighter (1.8oz vs. 2.75oz)

While retaining all of the positive attributes of its bigger brother: Reduced recoil, reduced muzzle rise, and reduced flash! Even with its reduced size and weight it still remains very competitive with other "Big Box" companies while having a more "streamlined" appearance.

  • Threads: 14-1LH
  • Material: Military Grade 17-4PH Stainless Steel
  • Length: OAL 2.1"(53.4mm), Added length 1.5" (38.1mm)
  • Weight: 1.8 oz, 51 grams
  • Finish: Matte Black Nitride
  • Caliber: 10mm bore will work with 5.56, 5.45, 7.62x39, 9mm (not for use with .308 or x54r, please purchase the original RRD-4C)
  • Manufactured in the US and counts as 1 922r compliance part


  • Russian, Bulgarian, Hungarian, East German, Polish, Romanian - AK, AKS, AKM, AKMS
  • Yugoslavian/Serbian M64, M70, M72, OPAP, PAP
  • Chinese Variants with 14mm threads
  • US AK/AKM clones - Century, DDI, IO, etc.
  • WILL NOT FIT VZ.58 and its variants

Since the release of the original RRD-4, we have been tweaking the design 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!

Additional Pictures can be found HERE! 

* Reduces flash on barrels 11" and longer



Reviews (15)

Awesome Obvi

Written by Chrystilinn Johnson on May 16th 2022

This looks incredible on my Zastava M90! I searched and searched and found this muzzle break. It is awesome, helps with recoil, and the sound is poppin! Love having a JMAC piece on my rifle!

Muzzle brake

Written by Kenneth Ayers on Apr 26th 2022

After watching klayco add one to his m90 on YouTube I wanted to give one a try. It absolutely turned my m90 into a laser beam with 77gn bullets. It shot 3/4 in groups at 100m. I'm 100% happy and amazed at this product I'll be buying another for my m70 and Polish underfolder.

4C 14-1LH Slim

Written by ANDYH. on Apr 25th 2022

Looks, fits and works perfectly.

4C 14-1LH Slim

Written by Corey on Mar 28th 2022

Lightweight, functional, and looks great! I’ll definitely be buying more for my other rifles. I highly recommend.

RRD-4C 14 Slim

Written by Javoughn Wise on Dec 3rd 2021

Perfect fit on my ZPAP M70. Fast shipping. Will be shopping here again very soon. Very impressed.

RRD-4C slim

Written by Heath Zeeb on Nov 27th 2021

Awesome muzzle device. Really tamed the recoil on my Zpap M70. Fast shipping, great customer service. Will continue to buy from Jmac. Love their products.


Written by Lee on Nov 27th 2021

Big upgrade from slant break. Put just over 200 rounds thru it so far. I'm impressed.


Written by Alex on Nov 10th 2021

I have not had the chance to shoot with it yet but as with anything JMAC Customs makes I expect it will perform above my expectations. It is well made and light weight, definite care was taken when it was machined.

RrD 4c slim

Written by Bradley Stevens on Nov 1st 2021

I have 3 of these and they are top notch Fit finish and machining is perfect and they reduce recoil on the overgassed AK rifles


Written by Cody on Oct 28th 2021

Beast muzzle device I’ve tried. VERY noticeable recoil reduction.

Muzzle break

Written by Bailey Kestner on Oct 25th 2021

Only put around 200 round but work great so far

RRD-4C 14 Slim

Written by Logan gutierrez on Aug 15th 2021

This muzzle device looks fantastic. It functions well, aggressively diverting gasses to either side of the shooter. It makes a noticeable difference in horizontal deviation. Would recommend, especially for shooting outside.

Seems good

Written by Jon Pike on Sep 17th 2020

Went right on the gun no hassle and does what it says

4C slim

Written by John hopkins on Jun 1st 2020

Great Quality and finish! Fit right on my Norinco 84S pre-ban in 20 seconds! Looking forward to trying it out when the ranges finally open in PA.

Outstanding product

Written by Robert on Oct 1st 2019

Great break! Excellent fit and finish!

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