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Questions & Answers
Is this compatible with the NFA C-5 billet lower? Specifically the lower that takes MP5 style magazines?

No it doesn't work with the C-5 lower. I just bought both. I got the "Spartan" brand upper which is the same as NFA, from Joe Bob Outfitters. The last round bolt hold open on the upper interferes with the feed ramp on the lower, and the bottom of the upper isn't wide enough to accept the MP5 mags. I was hoping to put this upper with my C5 lower but I will have to build my wife's glock lower with this upper. I guess the C5 rear charge upper is the only one that will work with the C5 lower, I read that the bottom of the upper is machined wider for the MP5 mags. If you are a machinist and u want to use this upper for the left side chargeing option , u can remove the last round bolt hold open and mill the side wall wider were the mag meets the upper. I literally just opened my upper so I haven't measured how much needs to be removed, looks like somewhere between 1/8"-3/16" per side . Hope that helps.

by Kenny Dowell, Verified Owner, October 26, 2021

Product No Longer Available

Unfortunately New Frontier Armory New Frontier Pistol Cal Upper Side Charger Billet Black is not listed by OpticsPlanet.You can also explore other items in the Gun Parts, AR 15 Parts, Rifle Parts, AR15 Upper Receivers yourself to try and find the perfect replacement for you!

Product Info for New Frontier Armory New Frontier Pistol Cal Upper Side Charger Billet Black

Our uppers use a side charger system that functions much the same way as a bolt action AR. We have achieved a very quiet, smooth operation side charger system. When paired with our lower receivers, it forms the basis for a very quiet, very accurate AR. The side charger system works by charging the magazine from the chamber end against a stationary source as the magazine is pushed forward. The spring for the magazine release must be pushed all the way into the magazine release catch. Pressing the 'release' button with the tip of the magazine follower is the same as a charging handle that has been pushed all the way in. The lip of the mag well needs to be filed down very slightly to prevent the magazine from sliding forward onto the bolt as the magazine is inserted. We highly recommend only using one brand new bolt for the mag well and one brand of powder for the bolt. If you have a Colt style bolt release, please use a Colt style extractor for the magazine release.image

Package Contents:

  • New Frontier Armory New Frontier Pistol Cal Upper Side Charger Billet Black

AR Upper Receiver Parts

1–60 / 60
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9mm Luger Ammo

1–42 / 42
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Gun Parts and Accessories

1–26 / 26
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Gun Triggers

1–15 / 15
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List of Unorderable Models

  • New Frontier Armory New Frontier Pistol Cal Upper Side Charger Billet Black , MPN: PC-NRSC , Code: 3TE-UPR-PCNRSC-PC-NRSC
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