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  • .450 Bushmaster Caliber Aluminum Gas Checks

.450 Bushmaster Caliber Aluminum Gas Checks


 Product Description

These are crimp on aluminum .45 caliber gas checks, they are about .125 in overall height. Made for .450BM AR rifles using a custom FreeChex III tool.

The checks are sold in resealable clear plastic bags. USPS flat rate boxes and First Class mail are used to reduce shipping cost. Most orders ship in one business day Monday - Friday.

Sold in 4 quantities: 100 for $4.99, 250 for $9.25, 500 for $16.50 and 1000 for $29.00.

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 Product Reviews

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  1. perfect fit. 5 Star Review

    Posted by on Aug 22nd 2019

    I’ve had bad luck with other brand gas checks so I thought I would try Sage’s. I couldn’t have asked for a better fit on the lee 300gr flat nose mold. I also ordered 30cal checks in hopes of a better fit and they were a beautiful fit too at a great price. Thank you!

  2. the best if have used 5 Star Review

    Posted by on Apr 30th 2018

    ordered these for a 325 grain cast boolit they are great in my custom thumper 2000+ fps absolutely no leading will be buying more unbelievably fast shipping also got 7mm 30 cal. 35 cal. and 44 cant beat em

  3. These work on other .458 diameter projectiles 5 Star Review

    Posted by on Apr 10th 2018

    I purchased a .450 BM plus mold. I won't cast until late May. I live in Canada and it's not good casting weather. What I did find with these gas checks is they fit on my other .458
    cast projectiles they fit Tight and don't spin on the shank a good solid bond. They are .125 height so bearing surface to rifling is increased. I did not find one check laying in the snow. They hold on . I tested moderate range loads and full power hunting loads. Accuracy is just as good as with any copper that's out there. If you own a 4570 450 marlin
    458 Win Mag 450 BM or any other .458 give these a try . You will not be disappointed . I didn't dig any projectiles out of the bank as I have better things to do than than dig in the hard frozen bank.
    This is my 50th anniversary for reloading and casting. I could write a book on my experiences. Good luck any enjoy our sport.



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