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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles.

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  #1  
Old 05-17-2018, 11:20 PM
isntzen isntzen is offline
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Question M1a Inquiry RE Accuratizing

To accuritze and achieve a 18 to 20 inch barrel; do I start with a national match and shorten the barrel 2 inches (how difficult?), or better to purchase scout squad and modify? Also hoping to keep weight down while routinely grouping no more than 1.5 moa. Informed opinions will be highly appreciated. Thanks in advance.
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  #2  
Old 05-18-2018, 1:29 AM
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H2oman will be here soon, I'd like to know the Faxon M1A barrel is. But I have a JAE G2 stock on my scout but can't recall groups it's been awhile.

Good barrel, shimmed gas system, good bedding/chassis.
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  #3  
Old 05-18-2018, 7:42 AM
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Just buy a Krieger med. weight 18.5” stainless barrel from the get go...If you want it black have it nitride coated by Jon Wolfe...

Here’s the Krieger 18.5” barrel on Fulton’s site, http://www.fulton-armory.com/barrelk...1x12dmr-1.aspx

There are other less expensive Scout length barrel options, but buying a full length M14 profile match barrel and cutting it down will be the most expensive route.


Mac
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  #4  
Old 05-18-2018, 8:30 AM
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As Mac mentioned, go with a good 18” bbl from the start, no need to cut down a new barrel. What are you going to feed it? Optics or irons? Just curious.

Shimmed the gas system, Sadlak op-rod and piston and Wolff springs in my factory Springfield Scout. I just have it in a non bedded USGI fiberglass stock. Accurate enough for me with irons shooting 168gr FGMM and Privi ammo and better than when I brought it home. Last groups I measured at 100yds were about 1.5 to 2.0 MOA(?)
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Old 05-18-2018, 8:37 AM
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For a lot of shooters a clean 4 lb trigger pull will go a long way to making
your rifle more accurate.
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Old 05-18-2018, 2:34 PM
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Quote:
Originally Posted by toiletfighter View Post
As Mac mentioned, go with a good 18” bbl from the start, no need to cut down a new barrel. What are you going to feed it? Optics or irons? Just curious.
Will mount a PA scope. Intending to extend the effective range of the M1a with 18 to 20 inch barrel without doubling the price. I'm pretty sure I'm not the first to walk down this path.
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Old 05-18-2018, 5:35 PM
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I went with a Criterion 18 1/2" barrel on my Polytech. Many of the shorter barrels are a medium weight profile. Stiffer, but overall about the same weight as the longer barrels.
If you plan on installing a forward (Scout) scope setup, some of the forward mounts won't work with the medium weight barrels.
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Old 05-19-2018, 12:10 AM
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Quote:
Originally Posted by Sailormilan2 View Post
If you plan on installing a forward (Scout) scope setup, some of the forward mounts won't work with the medium weight barrels.
Thank you. So what is the preferred mount for rear position on the Scout?
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  #9  
Old 05-19-2018, 5:39 AM
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I use the ARMS #18 M21 mount on my scout length m1a
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Old 05-19-2018, 5:49 AM
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Quote:
Originally Posted by isntzen View Post
Thank you. So what is the preferred mount for rear position on the Scout?
Bassetts are good. SEI is good. I'm sure there are others that are good too. Bassetts and the SEI can be taken off and reinstalled with almost no zero loss. I have a Bsssett, which I like very much. Light weight and relatively inexpensive.
I have two S&K mounts, but I have not used them much. So, I have no idea if they can be removed and reinstalled with no zero loss. But, I don't think they can. They appear to be functional and solid. So, if used with no idea of taking them off and reinstalling them, they are probably suitable. They are cheaper than the others.
I stumbled across a Ewings on EvilBay, and got it. No longer in production. It appears to be a low tech Bassett. Very simply made, but made out of still rather than aluminum like the Bassett. If I found another at a cheap enough price I would get one.

Last edited by Sailormilan2; 05-19-2018 at 7:56 AM..
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  #11  
Old 05-19-2018, 7:50 AM
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Bassett low Picatinny mounts will return to zero within 1/2 MOA for me. As for other mods to improve accuracy:
Shimming the gas cylinder/front band.
GI stock instead of the Springfield poly stock.
Trigger job bringing pull down to around 4-1/2 lbs.

Last edited by smoothy8500; 05-19-2018 at 7:53 AM..
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  #12  
Old 05-19-2018, 9:54 AM
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H2oman still around? That guys the god of m1as
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  #13  
Old 05-19-2018, 10:47 AM
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Quote:
Originally Posted by isntzen View Post
To accuritze and achieve a 18 to 20 inch barrel; do I start with a national match and shorten the barrel 2 inches (how difficult?), or better to purchase scout squad and modify? Also hoping to keep weight down while routinely grouping no more than 1.5 moa. Informed opinions will be highly appreciated. Thanks in advance.
The M1a stock design is specific to iron sights.
1.5moa is very good shooting with iron sights.

Quote:
Originally Posted by isntzen View Post
Will mount a PA scope. Intending to extend the effective range of the M1a with 18 to 20 inch barrel without doubling the price.
The M1a is NOT a good action to put a scope on.
Neither the reciever or the stock are really setup for use with optics.

A 308 AR is a MUCH better design if you want to use a scope on an autoloading 308.

Quote:
Originally Posted by isntzen View Post
I'm pretty sure I'm not the first to walk down this path.
People make bad decisions all the time.
Some people even learn from them.
Other's don't.
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  #14  
Old 05-19-2018, 12:24 PM
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Quote:
Originally Posted by ar15barrels View Post
The M1a is NOT a good action to put a scope on.
Neither the reciever or the stock are really setup for use with optics.
A 308 AR is a MUCH better design if you want to use a scope on an autoloading 308.
You will get no argument from me that the AR is not a better platform for optics. However, my once spectacularly good eyesight has degraded and using irons has become a laborious exercise yielding less than optimum results. I use optics of some kind on every firearm I own.
I want to add an M1a to the collection for all the best reasons others do. I want accuracy, I don't want the rifle to be as long as a flag pole, and I would like to avoid over-spending for the experience. I sincerely appreciate all the help I have received to this point.
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  #15  
Old 05-19-2018, 12:42 PM
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Quote:
Originally Posted by isntzen View Post
I want to add an M1a to the collection for all the best reasons others do.
I want accuracy
M1a's are low on the relative scale of firearms accuracy.
Heavy moving parts pushing and sliding on the barrel are no good for accuracy.

Get one because they are great guns.
Don't try to make it something it's not though.
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  #16  
Old 05-19-2018, 2:22 PM
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Quote:
Originally Posted by ar15barrels View Post
Get one because they are great guns.
Don't try to make it something it's not though.
I fully understand that at least to some extent, I am swimming upstream with this endeavor. Nevertheless, I am looking for suggestions re. an effective set of swim fins, not at all in need of council to turn around and swim with the current instead.
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  #17  
Old 05-19-2018, 2:29 PM
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Quote:
Originally Posted by isntzen View Post
I fully understand that at least to some extent, I am swimming upstream with this endeavor. Nevertheless, I am looking for suggestions re. an effective set of swim fins, not at all in need of council to turn around and swim with the current instead.
You can dramatically improve the accuracy of any M1a by simply turning the gas spindle valve off.
Do that first before you rebarrel just to see what the intrinsic accuracy of your existing barrel is.
Then, turn it off after the rebarrel and hopefully, the new barrel will be more accurate.
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  #18  
Old 05-19-2018, 2:38 PM
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I'd get a loaded scout and go from there, at least the trigger work is done and you're starting out with a NM barrel. Tonyben3 has some great videos on youtube to help you fine tune from there. Personally I think Springfield and GI fiberglass stocks are garbage, go with wood and don't expect glass bedding to change the world.
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