AR mags for the Whisper? and some progress

[mstarling]

Have noticed that folks seem to use 20 round mags for the 300 Whisper. Is there a problem with 30s?

What mags have you found to work well?

All of my parts are in save for the Black Rain billet Upper/Lower pair and I expect those late next week.

The following parts will be used in the project:

16+" SS Paladin barrel and 3 position gas block
.308 caliber YHM Phantom flash hider/comp
YHM full length lightweight free floating handguard
RRA 2 stage National Match LKP
Mil-spec buffer tube with LMT SOPMOD stock

Have mocked up the barrel in another upper but not installed a gas tube so the Paladin 3 position gas block is set in the off position. Was finally able to make brass that works from LC 97 5.56x41 using a small base sizing die and a 300/221 Redding die set.

A load of 13.4 gr of 2400 with 147 gr FMJBT projectiles seems to do a decent job of fireforming the brass and is easily extracted. A subsonic load doesn't blow out the shoulder at all.

Single round feeding from old Colt or AdventureLine 20 rnds mags seems to work OK.

[nwcid]

I think the 20's are more popular since guys use guns with bipods. When using a bipod 30rd mags hang down too far. I use 20's in my guns that I use off bipods.

[Colohunter]

Originally Posted by nwcid

I think the 20's are more popular since guys use guns with bipods. When using a bipod 30rd mags hang down too far. I use 20's in my guns that I use off bipods.

I agree, I think the 20 rnd mags are more a preference of length. I have used 30rnd Pmags and 30rnd Cproducts magazines without an issue.

[cav_scout_tj]

The Cammenga ez-mag works great too, easy to load:

[strycnine]

Will the 20rd P-Mags work?

[Colohunter]

Originally Posted by strycnine

Will the 20rd P-Mags work?

My 30s work fine, I would think that the 20 wouldn't be a problem.

[nwcid]

Originally Posted by strycnine

Will the 20rd P-Mags work?

Thats all I run in mine. I could not get stock Colt style 20rd mags to feed in mine.