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Posted: 3/18/2010 8:17:01 AM EDT
I had to sell my AR to pay my taxes this year   but I will soon be able to replace my loss with something else. At the moment, I've got a built lower and I was thinking of putting a 20" chromed upper on it and calling it a day.
However, I might feel the MSAR E4 calling my name. I have a few questions. What is the muzzle blast like on the 20" E4? One thing I never did like about the AR carbines was the way the muzzle blast was so harsh if you needed to shoot without earpro. Is the 20" MSAR more like a 16" AR or 20" AR on this count? What kind of accuracy will the E4 deliver compared to a 20" AR without a free float handguard? I'm also paying off a Trijicon TA33 I have on layaway next month. Has anyone used a TA33 with an E4, and does it work well? Will the factory TA33 AR-15 flat top mount work, or would it be too tall? What twist rate does the E4 barrel use, and is it chrome lined? Thanks for listening to my dumb questions 
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can't speak for the 20", but i do know that i would NOT enjoy shooting my 16" without EP... it's painful enough to stand a few feet back while my buddy shoots it.
The accuracy was pretty damn impressive for a 16" rifle without freefloating. At 50 yards, i got .6" or better groups with good ammo... 1.5" with wolf crap. At 100, i was pushing 1.5" with FMJ white box ammo. 3" or so with wolf... runs like a clock, FAR more fun than any of my AR's and i'd much rather have this gun for any scenario out to 300 yards. With a light mounted, it is a PERFECT CQB weapon, or home defense gun. |
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1) I never found muzzle blast objectionable on my 16" STG's but adding a Levang compensator (which channels all the muzzle blast forward, see pic below) has made it more pleasant to shoot, especially for those standing nearby.
2) I haven't shot any of my STG's for group size but the 300m gong is doable offhand all day if I do my part. 3) IIRC Dave from MSAR has a TA33 on his STG and loves it. Since the E4 optic rail is the same height as a flattop AR the TA-33 flattop mount should work fine. 4) 1:8 and yes, it is chrome-lined. HTH... Tomac STG bbl w/tulip next to STG bbl w/Ratworx adapter (not needed for E4 bbls) & Levang linear compensator: 
STG-556 w/E4 optic rail, Eotech 517, Magpul MBUS, 9" accessory rail, Fenix TK20 taclight & 42rd mag: 
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