Will 300 BO rounds fit in my regular AR 15 magazines that hold
My 5.56 and will these magazines fit the Saint 300 or do I need new magazines?

Question

James G. · Answer

Yes Eric, 300BLK will fit in most AR 15 Magazines. There are still 300BLK specific AR Mags as well.   https://www.magpul.com/products/pmag-30-ar-300-b-gen-m3-300-blk

Milton V. · Answer

Should fit just fine.

Randy I. · Answer

yes it will fit the 300 Blk will fit in 95% of the AR-15 mags with no issues

Ask the Community

Will 300 BO rounds fit in my regular AR 15 magazines that hold My 5.56 and will these magazines fit the Saint 300 or do I need new magazines?

Product Comparisons

Firearms

Also in Firearms

Ammo

Also in Ammo

Accessories

Also in Accessories

NFA | Class III

Also in NFA | Class III

Brands

Also in Brands

Specials

Also in Specials

Handguns

Rifles

Also in Rifles

Shotguns

Used Guns

NFA | Class III

Black Powder

Other Ways to Browse

Ask the Community

Will 300 BO rounds fit in my regular AR 15 magazines that hold My 5.56 and will these magazines fit the Saint 300 or do I need new magazines?

Product Comparisons