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M21 accuracy

This is a discussion on M21 accuracy within the Accuracy forums, part of the M14 M1A Forum category; Fellas, this is my first post. I'm buying an M21 in one week. Its got the krieger barrel. I will be mounting my Leupold Mk4 ...


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Old July 22nd, 2012, 05:46 PM   #1
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M21 accuracy

Fellas, this is my first post. I'm buying an M21 in one week. Its got the krieger barrel. I will be mounting my Leupold Mk4 on it. Without going into hand loading, what kind of accuracy does the M21 hold with Federal SMK 168 or 155grn? I only plan on taking this rifle to 750yds Max. So I'm not expecting this gun to be some 1000 yard stick. I have other guns for that,lol.

Thanks fr all the replies.

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Old July 22nd, 2012, 06:02 PM   #2
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Have one, you will be very satisfied. The kreiger Hvy bbl is sweet. Top of the line brother!

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Old July 22nd, 2012, 06:10 PM   #3
 
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Mine likes 175's out past 600 yards so I just use 175's all the time, only 1 dope sheet that way. It will do fine at 1000, no need to limit to 750, 1 moa or less easily. 100 yard zeros it will hold 1/2 moa. All my shooting is prone using bipod.

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Old July 22nd, 2012, 06:13 PM   #4
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Thanks for the support! Am I expecting to much by expecting this rifle to hold 1 MOA out to 600? I'm trying to do as much research as possible on this forum, but this little internet tablet I'm using isn't to compatible with this forum. If it really can't hold 1 Moa then I'm really gonna be annoyed that I spent over 3k on it and bought a lower model instead and not have the expectations,lol.

In short, would I be better off buying a standard M1a and using the remaining money to buy a GAP10 for precision?

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Old July 22nd, 2012, 06:19 PM   #5
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I forgot to add most of my shooting will be with a bipod and rear bag. I will seldom shoulder fire, so I'll take whatever accuracy comes with my shoulder as my skill level.

I really appreciate the quick replys, seems like a great forum!

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Old July 22nd, 2012, 06:48 PM   #6
 
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I've found that when you get at that distance it's hard to get an accurate moa measurement, lot of other things make it difficult to tell. Last time I was shooting at 1000 I was dialing in about 8 ft of windage.

If I ever buy an AR it will probably be a GAP 10.

This is how we shoot, the M21 has no problems with these plates, some are 1 moa and some are larger. Always prone with a bipod, no rear bag. It will keep right up with the bolt guns.

At 100 yards we shoot at targets.
200 yards 2" x 2" plate
300 & 400 we use 4" diameter plate
500 & 600 yards we use 6" diameter plate
700 yards 10" x 10"
800 & 900 we use 10" x 14"
At 1000 we use a 20" x 32"
We even backed up one time and shot out to 1200 yards and were ringing the 20" x 32" plate. I hit it about half the time at that distance.

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Old July 23rd, 2012, 12:44 AM   #7
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What exactly is it that makes an M21 and M21, other than it says so on the heel. Just curious as I have a Fulton receiver heel stamped "US Rifle 7.62MM M21". I'd hate to build it into something it really isn't.

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Old July 23rd, 2012, 06:35 AM   #8
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The US Army had/has a sniper rifle based on the M14 designated as the M21. There are Army pubs out on the web that describe it in detail.

Other than that, the name "M21" on a commercial rifle means nothing. The commercial manufacturers can call their rifles whatever they want.

Springfield Armory has a commercial rifle they call "M21" that has some match tuning and some other features that the Standard rifles don't have, but it's not an Army M21. They are just using the name to confuse people.

Apparently during the AW ban it was illegal in certain states to have a rifle with "M14" stamped on it, so some of the commercial companies stamped them "M21" instead. That's all it means, nothing more.

Of course, just because a commercial receiver has "M14" stamped on it doesn't make it a real M14, either.

Thanks from Mainzer
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Old July 23rd, 2012, 07:26 AM   #9
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I'll answer my own question. From Wikipedia:

"The United States Army wanted an accurate sniper rifle during the Vietnam War. The M14 was selected because of its accuracy, reliability, and the ability for a quick second shot.

As a result, in 1969, the Rock Island Arsenal converted 1,435 National Match (target grade) M14s by adding a Leatherwood 3–9 Adjustable Ranging Telescope and providing National Match grade ammunition. It was designated the M21 in 1975. The M21 remained the Army's primary sniper rifle until 1988, when it was replaced by the M24 Sniper Weapon System; some M21s were later re-issued and used in the Iraq War.[1]

In standard military use, the M21 uses a 20 round box magazine as the other members of the M14 family and weighs 11 pounds (5.27 kg) without the scope. The U.S. military never officially authorized or purchased magazines in any other capacity, although 5- and 10-round magazines are available".


Taken with 2336USMC's info, a pretty thorough description of the M21.

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Old July 23rd, 2012, 07:45 AM   #10
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I guess you're getting a new one? SAI is awfully proud of that product. What you won't get in USGI parts nowadays should be compensated somewhat by the fine barrel you can expect. And it'll be first-class glass bedded and fitted to the stock. As far as available factory ammo commensurate with the rifle's capacity to hold a center, FGMM's gonna be about the whole enchilada right now. It's high $$$, but I haven't seen anybody letting go of their stashes of U.S. M852 or M118LR. Save your fired cases cuz you'll be reloading if you like your rig.

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Old July 23rd, 2012, 11:37 AM   #11
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Thanks for the replies fellas!
I bit the bullet today and boughtt the gun. However, I am offshore and wont be back in for another week. I am prior Navy, so that's why I'm in love with the M14 platform. But for the money, (3400) I was REALLY considering a Gap10. Two of my close buddies have them and they are half moa out to 750 for sure. That extremely impressive for a Gasser. But the look, feel and timeless beauty of the ole M14 is what's making me buy this M21.
As stated earlier, I may shoot the 175s but I dont really plan on going past 750yds. So that's why I'm considering a lighter 168 or 155grn.

On another note, I'm going to be creating a new thread later asking for scope mounts and a few other mods. I'm really not looking for much gunsmith work unless I absolutely need it. I'll be quite pissed if i have to pay for smith work after shelling out 3400 for the gun, lmao.

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Old July 23rd, 2012, 03:11 PM   #12
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Springfield's M21 is simply the Super Match with their adjustable comb stock. Great target rifle, no good to have to carry it around much. It'll really shoot those Federal 168 GMM at the ranges you envision.

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Old July 25th, 2012, 09:52 AM   #13
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It carries well, you just cannot be a pansy. For those of us that carried an M60, sort of like that when it is fully dressed out and loaded up.

The M21 is a great rifle. I think a factory one would benefit from a Sadlak piston, but you don't necessarily need one right away.

Thanks from Renisin
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Old July 25th, 2012, 11:35 AM   #14
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Pretty sure the op is getting a Fulton that is heal stamped M21. I'm not certain if that rifle has the same stock as the SAI M21. If not you might have wanted to check out the SAI SM rifle which I think is comparable and pretty sure less coin too. In case your wondering about what I'm talking about check out the SAI website and the M21 they sell for a pic of the stock.

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Old July 25th, 2012, 11:39 AM   #15
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For the OP SAI M21 stock with built in riser


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