Anyone experimented with a 3 Rd Mag

Talk about the AR15 style rifles chambered in 450 Bushmaster.

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Anyone experimented with a 3 Rd Mag

Postby Buckeye45 » Fri May 26, 2017 10:10 am

Hey all, have been playing with the 2 uppers I've acquired and got to thinking about hunting season. My one build is going in the direction of light sleek low drag type set up and noticed the old 10 Rd mag I had laying on the bench. Has anyone ever converted one of these for the 450? If so how did it work? My line of thought is we can only have 3 rounds in the rifle, so a 3 shot short mag would be ideal. I could even go for 2 rounds in the case I shot the gun dry for and need a kill shot. After all these years I admit I still get buck fever. Thanks for any feedback.
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Re: Anyone experimented with a 3 Rd Mag

Postby dantheman » Wed Jul 26, 2017 4:18 pm

I'm in the process of working on a 3 round mag right now. While the 5 round factory mag works fine, it uses a 20 round, 556 body. In NY state we are restricted to 10 round magazines. I don't want a LEO to see the factory mag and start throwing hypotheticals at be about turning it into a 20 round , 556.
I used a blue follower and used a vise to adjust the mag lips a little. I'll shoot it later in the week to see how reliable it is. This will eventually be a fixed mag rifle that won't readily be removable. I'm using it for hunting so I can't imagine needing more than 3 rounds.

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Re: Anyone experimented with a 3 Rd Mag

Postby North40 » Sat Sep 09, 2017 7:12 pm

I live in Ohio as well.I'm currently using Lancer advanced war fighter 10 Rd mags.They hold 4 450bm rds and I have had 0 problems with the 3 I have.I use them as is with the .556 followers
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Re: Anyone experimented with a 3 Rd Mag

Postby Gtek » Wed Sep 27, 2017 7:04 pm

I modified 10 round PMAGS and they have worked very well. Ran 1/2" ball mill down center to depth of follower deck height and left spring alone (yes it makes little holes in follower). Took very sharp wood chisel and removed rib down front center of mag body to flush and smooth. File and polish inward angle of about 30 degrees with radius matching .500" case body on forward top mag edge, once close thumb push rounds from loaded position forward till clean slide forward/up. Holds three really well and four will go but gets fluffy on lips, I have been hunting mine, one in and two more in pockets. Range time has been flawless and does not scar up brass coming out from mag lips.
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Re: Anyone experimented with a 3 Rd Mag

Postby Jim in Houston » Sat Sep 30, 2017 10:47 am

North40 wrote:I live in Ohio as well.I'm currently using Lancer advanced war fighter 10 Rd mags.They hold 4 450bm rds and I have had 0 problems with the 3 I have.I use them as is with the .556 followers


Same here. Unmodified Stoner 5.56 10 round mags holding 4 450 BM's. If you need to go down to 3 rounds, replacing the 5.56 follower with a 450 follower with the longer "legs" might do the trick.
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Re: Anyone experimented with a 3 Rd Mag

Postby Jim in Houston » Sat Sep 30, 2017 11:07 am

Just noticed these linked from another thread. http://www.chambertactical.com/product/ar-15-magazine-capacity-limiter-3-pack/

They are shown for a curved mag, but they have a straight section and could be cut down to use the straight section to reduce the capacity of a 5 or 10 round 5.56 mag.
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