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Questions & Answers
Will this work with the 10 rd hexmag? (5.56, 2.23, 300AAC, .375 & .458 Socom version) Manufacturer Answer

No. this will work with Fab Defense magazines Only

by FAB Defense, Manufacturer, November 5, 2025
will this fit a 300BLK rifle? Expert Answer

Yes, the FAB Defense Ultimag 10R Pentagon Magazine Kit will accommodate 300 Blackout.

by Ethan, Gear Expert, February 22, 2023
Customer Reviews
Helpful Positive Review
California sucks if your a responsible gun owner. The FAB Defense Ultimag 10R Pentagon Magazine Kit is a great little tool when your stuck with a 10rd limit. Great way to carry 50 rounds without having 5 small mags that don’t fit right in pouches. Al...
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9/10 found this helpful
Helpful Positive Review
50rds N.Y.S. LEGAL by William Clay, September 1, 2020
1ounce u learn to switch mags u can do this in seconds, 1 out of 5 i carry in truck empty an keep it in rifle so the other 40rds are right there, been pulled over b4 an hand my pistol permit w/lic an never have a problem.
8/12 found this helpful
Helpful Positive Review
great product looks cool by extraordinary bro, March 19, 2023
ilove the look an it definitely give my ar15 some flair an style. Its draws alot of attention at gun shows an gun range. never use it for hunting but i wouldn't risk it. this is a good magazine. � � � � thank the gun lords for this masterpiece ��
2/5 found this helpful
Helpful Positive Review
what are you looking at by Vernster, Verified Owner, June 8, 2021
Colorado has a max 15 rd. limit on rifles so I thought I'd buy this cute little conversation piece to flash around at the range. It's nicer than I expected and utilizing the ultimag by Fab Defense, a quality designed unit, it should prove to be in...
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8/10 found this helpful
Helpful Positive Review
FAB Pentagon Mag Kit for freedom by C Marcus, Verified Owner, December 23, 2020
I just received my pentagon mag kit. I tested it on both 5.56 and 300 ACC blkout and performed perfectly. In a time of uncertainty it’s good to have something well made, performs as expected and shows a stand for freedom while thumbing up my nose at...
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8/8 found this helpful
Helpful Positive Review
fun to Shoot by Spu Irwin, Verified Owner, January 9, 2018
Seems to work Flawlessly , not to heavy, easy to clean , mags snap in place and have to be tightened by center Allen Key ( which is Not Supplied ) ,will only Except Their magazines . Works as a bi-pod also wish they made other mags for this .New Jer...
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12/13 found this helpful
Read All 11 Reviews
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Product Info for FAB Defense Ultimag 10R Pentagon Magazine Kit

The FAB Defense Ultimag 10R Pentagon Magazine Kit is a unique, ergonomic accessory that will greatly enhance your firepower while complying with a 10 cartridge limitation. FAB Defense constructed these Gun Accessories from rugged high-grade polymer, and you can use these kits on M16, M4 or AR15 variants. This FAB Defense Ultimag 10R Pentagon Mag Kit features an external coupler that doesn't replace the magazine floor plate. Add incredible tactical utility to your rifle with this FAB Defense Ultimag 10R Pentagon Magazine Kit.image

Specifications for FAB Defense Ultimag 10R Pentagon Magazine Kit:

Manufacturer: FAB Defense
Gun Model: M4, M16, AR-15
Fabric/Material: High Grade Polymer
Magazine Capacity: 10 Round

Features FAB Defense Ultimag 10R Pentagon Magazine Kit:

  • Highly ergonomic design.
  • Durable high grade polymer construction.
  • Maintains 10 cartridges limitation.
  • External coupler - does not replace magazine floor plate.
  • Compatible with M16/M4/AR15 variants.

Package Contents:

  • FAB Defense Ultimag 10R Pentagon Magazine Kit
  • 1x PMC Magazine Coupler
  • 5x Ultimag 10R Magazines

FAB Defense Ultimag 10R Pentagon Magazine Kit Orderable Models

List of Orderable Models

  • Open Box, Dealer Demo, FAB Defense Ultimag 10R Pentagon Magazine Kit, 5 Ultimag Magazines with Five, 5 Ultimags, 10 Round, Black, FX-PMCK , MPN: FX-PMCK-DMO , Code: 1S0-MGC-PMC-KIT-B-FX-PMCK-10RD-DMO-OB-A
  • Open Box, Dealer Demo, FAB Defense PMC Ultimag 10R Pentagon Magazine Kit, 10 Round, OD Green, fx-pmckg , MPN: FX-PMCKG-DMO , Code: 1S0-MGC-PMC-KIT-B-fx-pmckg-10RD-DMO-OB-A
  • Open Box, Dealer Demo, FAB Defense PMC Ultimag 10R Pentagon Magazine Kit, 10 Round, FDE, fx-pmckt , MPN: FX-PMCKT-DMO , Code: 1S0-MGC-PMC-KIT-B-fx-pmckt-10RD-DMO-OB-A
  • FAB Defense Ultimag 10R Pentagon Magazine Kit, 5 Ultimag Magazines with Five, 5 Ultimags, 10 Round, Black, FX-PMCK , MPN: fx-pmck , UPC: 7290105942692 , Code: 1S0-MGC-PMC-KIT-B-FX-PMCK-10RD
  • FAB Defense PMC Ultimag 10R Pentagon Magazine Kit, 10 Round, OD Green, fx-pmckg , MPN: fx-pmckg , UPC: 7290105947468 , Code: 1S0-MGC-PMC-KIT-B-fx-pmckg-10RD
  • FAB Defense PMC Ultimag 10R Pentagon Magazine Kit, 10 Round, FDE, fx-pmckt , MPN: fx-pmckt , UPC: 7290105947475 , Code: 1S0-MGC-PMC-KIT-B-fx-pmckt-10RD
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