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Longer sight radius tends to lend itself to increased precision and higher velocity because more powder is burned.
 

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As far as actual mechanical accuracy - the guns are probably almost identical.



When practical accuracy comes into the picture PPS1980 correctly points out that the longer sight radius is generally an asset to most shooters.
 

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No expert here, but the higher fps from the 5" should translate to increased accuracy as distance increases. However, long distance isn't exactly the best use case for pistols.

Also, I chose 9mm specifically because it so common, but that doesn't mean it couldn't perform better. Why not increase its performance with a little longer barrel? If its not my CCW I'll take the extra inch in length for slightly more power and accuracy.

I gave my 4" to a family member and purchased an M1 5" and am happy I did (part of that is knowing my brother in law has a reliable pistol to protect his family).

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If you are looking for better accuracy, the first thing I would try is different ammo. Every gun test that uses different ammo shows quite a bit of difference between brands and types. :p
 

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Longer barrels have longer sight radius and the round will travel a little faster...so yes. Enough to make a difference? Probably not. I would expect the guns to be essentially the same in all respects under 50 ft.
 

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Both are accurate firearms, but accuracy falls on the shoulders of the shooter. 5" has a longer sight radius, so it might be a little easier to keep the sights lined up on target, but, it all really boils down to the shooter knowing his gun and the ability to keep it on target.
 

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Agree with all the above. I have a 4” M1 and a 5” M1. Both are great. I got the 5” model for IDPA, etc. Longer sight radius helps a little bit. For carry, I go with the 4”. Since they are both M1 the mags are interchangeable too.

Regards,
Dave
 

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I have a 4" and 5" M2s. I certainly can't see any accuracy difference. Unless you're a top tier shooter, I suspect you won't either.
 

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For HD/SD purposes, as it pertains to accuracy, it won't make any difference. If you're shooting at 100 yards, or greater, the 5", theoretically, should edge out the 4".
 

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Agree with all the above. I have a 4” M1 and a 5” M1. Both are great. I got the 5” model for IDPA, etc. Longer sight radius helps a little bit. For carry, I go with the 4”. Since they are both M1 the mags are interchangeable too.

Regards,
Dave
Do you shoot your 5” M1 in USPSA Production div ? It is not specifically listed on the allowed list the M1. 4” is.


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Sorry, I haven’t done USPSA so I can’t answer that. Others on here know a lot more than me in terms of the rules. If the 4” M1 is ok, and the 5” M2 is ok, then I would expect the 5” M1 should be ok as well. I understand that there are some requirements regarding the # of pistols sold or manufactured, but I don’t know for sure, or if that is relevant here.

Dave
 
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