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Questions & Answers
will this jam nut fit a ruger pc carbine 9mm Expert Answer

As long as the thread pitch is 1-2x28 it will work.

by Todd, Gear Expert, August 27, 2021
Can this be used in conjunction with a qd muzzle device for use with a suppressor? Or will it throw off the barrel/qd mount bore alignment? Expert Answer

I don't see any reason it would throw off the bore alignment.

by Todd, Gear Expert, August 27, 2021
Customer Reviews
Helpful Positive Review
Serves it's Purpose by Pierce, Verified Owner, December 14, 2020
I needed a little extra head room for my compensator and this did the trick. I purchased JPJN-12B-750 which is 3/8 in. thick. Not much to say, threads are solid and the machining is good. Finish is nice and not an afterthought. If you want to add som...
Read More...
2/2 found this helpful
Most Recent Reviews
Simple well made solution by OldBones, Verified Owner, October 16, 2025
Like anything JPE provides it is well machined. I would recommend this and other items by JPE...
Most Recent Reviews
Very well made by Mark Johnson, Verified Owner, November 2, 2024
Precision timing nut for brakes and comps. Don't go cheap on these necessary parts. The threads are clean and precise and it just works.
Most Recent Reviews
best jam nut out there by Casey Osborn, Verified Owner, December 14, 2023
JP Enterprises makes good stuff and I really like their jam nuts They seem to match mil spec parts better and can't beat the quality. I've never had one come loose This one is just for looks as it will be behind a SOLGW nox 9 13.7 build
Most Recent Reviews
Serves it's Purpose by Pierce, Verified Owner, December 14, 2020
I needed a little extra head room for my compensator and this did the trick. I purchased JPJN-12B-750 which is 3/8 in. thick. Not much to say, threads are solid and the machining is good. Finish is nice and not an afterthought. If you want to add som...
Read More...
Read All 5 Reviews
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Product Info for JP Enterprises Jam Nut 1/2X28

Intended to be a very good item for pretty much anybody, we're sure you will appreciate the JP Enterprises Jam Nut 1/2X28.image

Formulated by using some of the most extremely durable and dependable resources in existence, these Rifle Parts by JP Enterprises will provide you with a product that will give many years of consistency.

JP Enterprises has been developing high quality merchandise for a number of years, and the JP Enterprises Jam Nut 1/2X28 is their particular way of demonstrating how much they are concerned.

Right here at OpticsPlanet, we ensure that it is our responsibility to get the best product for all your requirements, and featuring the JP Enterprises Jam Nut 1/2X28 is something that we are pleased to offer.

Features of JP Enterprises Jam Nut 1/2X28:

  • Jam Nut
  • 1/2 x 28
  • Superior construction
  • Reliable and long lasting materials

Package Contents:

  • JP Enterprises Jam Nut 1/2X28

JP Enterprises Jam Nut 1/2X28 Orderable Models

List of Orderable Models

  • JP Enterprises Jam Nut 1/2X28 .750, Black JPJN-12B-750 , MPN: JPJN-12B-750 , UPC: 812872021904 , Code: J5-CPW-JAM1228-JPJN-12B-750
  • JP Enterprises Jam Nut 1/2X28 .750 Stainless, Silver JPJN-12S.750 , MPN: JPJN-12S.750 , UPC: 812872021911 , Code: J5-CPW-JAM1228-JPJN-12S-750
  • JP Enterprises Jam Nut 1/2X28 .875 Stainless, Silver JPJN-12S.875 , MPN: JPJN-12S.875 , UPC: 812872021935 , Code: J5-CPW-JAM1228-JPJN-12S-875
  • JP Enterprises Jam Nut 1/2X28 .925 Stainless, Silver JPJN-12S.925 , MPN: JPJN-12S.925 , UPC: 812872021959 , Code: J5-CPW-JAM1228-JPJN-12S-925
  • JP Enterprises Jam Nut 1/2X28 .875 Black, JPJN-12B.875 , MPN: JPJN-12B.875 , UPC: 812872021928 , Code: J5-CPW-JAM1228-JPJN-12B-875
  • JP Enterprises Jam Nut 1/2X28 .925 Black, Black JPJN-12B.925 , MPN: JPJN-12B.925 , UPC: 812872021942 , Code: J5-CPW-JAM1228-JPJN-12B-925
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