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Thread: building an AR15 in 450 BM

  1. #1
    Boolit Master
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    building an AR15 in 450 BM

    Has anyone used a Polymer lower on a 450 BM upper?
    Are there any polymer lowers to stay away from?

  2. #2
    Boolit Master

    Moonie's Avatar
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    I have a polymer lower, I don't think I would put a thumper on it, I've used 6.8, 22 Nosler and 300 BO on it and it works well. I have thought about building a thumper but planned on using an aluminum lower. Heck my 22 Nosler I built using a polymer upper (with aluminum insert).

  3. #3
    Boolit Master dkf's Avatar
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    If you have to have a plastic lower the one with the best chance of holding up and the best track record is the GWACS Armory CAV15. It may not be prettiest but it works. The problem is they are hard to find and currently not in stock anywhere. The company is supposed to be resuming production within the next couple months.

  4. #4
    Boolit Grand Master Texas by God's Avatar
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    Quote Originally Posted by dkf View Post
    If you have to have a plastic lower the one with the best chance of holding up and the best track record is the GWACS Armory CAV15. It may not be prettiest but it works. The problem is they are hard to find and currently not in stock anywhere. The company is supposed to be resuming production within the next couple months.
    This^^^^^^

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check