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View Full Version : Milspec picatinny rail?


evidens83
10-11-2009, 9:17 PM
Is there a difference between a "Mil Spec" picattiny rail and a regular picatinny rail? For example http://yankeehill.bizland.com/store/media/Lightweights.jpg vs http://www.specopstactical.com/images/store/Yankee%20Hill%20Machine/YHM-9479.jpg Can I fit Magpul XTM panels on both?

evidens83
10-11-2009, 9:32 PM
And what do people here like better the XT or XTM? Which is a lower profile also?

pacrimguru
10-11-2009, 11:32 PM
there's only one standard size for picatinny rails. pretty much the only thing that is actually a different size when called "milspec" is the buffer tube. any other time a company calls a part "milspec", its their way of claiming that it's good in some way or another. XT's and XTM's are completely different things. it's more important which type you like since they're going on your gun. i believe their profile is just about the same.

NSR500
10-11-2009, 11:48 PM
To my knowledge the picatinny dimensions are standard, what might make one rail milspec over the other is material, and finish.

tomd1584
10-12-2009, 8:29 AM
i think the XTM's have a lower profile. i've been really happy with mine so far.

sd1023x
10-12-2009, 9:04 AM
I think the "mil-spec" moniker is just a commonly used marketing tool.

Not to threadjack, but on a side note, NATO has upgraded the 1913 picatinny to the new STANAG 4694 standard.

The MIL-STD 1913 standard, also known as the Picatinny rail system may be replaced by the proposed STANAG 4694, also known as the NATO Accessory Rail (NAR). The NATO Standardisation agency announced the new standards on May 8th. NATO member countries must now ratify the changes.

The changes included in the new standard include:

Metric measurements and reference drawings
Reduction of tolerances
Slight measurement adjustments
Addition of new measurements and tolerance

One of the benefits touted for the new standard is increased repeatable alignment of quick detach optics. The new NATO Accessory Rail uses the top surface of the rail for alignment rather than the V-angles on the sides as the Picatinny system does.

According to Janes, the new standard was a collaboration by a number of different firearms manufacturers and will maintain compatibility with the old Picatinny rail standard.
"Designed in conjunction with a number of weapon specialists including Aimpoint, Beretta, Colt Canada, FN Herstal and Heckler & Koch, the NAR system has full compatibility with current US MIL-STD-1913 specifications, also known as the Picatinny rail"

http://img59.imageshack.us/img59/9532/6cf829be19164421b8b7837.jpg

Read more on the new STANAG 4694 standard at DTIC.mil (*.PDF)

pacrimguru
10-12-2009, 9:08 AM
that's good news that the new is compatible with the old.

evidens83
10-12-2009, 12:15 PM
Very good to know sd1023x.