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To be honest, that title is rather tricky, and not just because I'm using the word "best" when only comparing two objects, rather than three or more. Know what I'm sayin'? Where my grammar trolls at?

Before I get into the RIS vs. RAS comparison, let me first specify the components of the two acronyms.

RIS = Rail Interface System
RAS = Rail Adapter System

There are actually quite a few variations of those two out there but after doing a bit of mild research on several major firearms manufacturer sites (e.g. Daniel Defense, Knight's Arm Co, etc), as well as a few other gun-related informational sites, I've determined that those are probably two of the more correct meanings. However, since there doesn't seem to be a standard definition that covers multiple manufactured rails, I'm not sure if there's a wrong answer either.


So what the heck is the difference between RIS and RAS then?

Find out after the jump...



Well, not a whole lot, as it turns out. They're both used for the same purpose: mounting accessories to your rifle, like tac lights, lasers, optics, vertical grips, etc. They both utilize the Mil-Std 1913 Picatinny Rail, developed by Picatinny Arsenal. Other than that, like I said, I really couldn't find a standard definition for either. It appeared to differ from website to website, therefore, I decided to stop worrying about it. So if you're shopping for a rifle with a rail system, or just the rail system by itself, don't worry about the nomenclature used to describe that rail system when it comes it being a RIS or a RAS. It'll fit with your rifle accessories either way.

Here are a few examples of rifles with varying rail systems on them:
http://www.pyramydair.com/s/m/G_G_GR16_CQW_Rush_Blowback_AEG_Airsoft_Rifle_Tan/2539


http://www.pyramydair.com/s/m/G_G_GR15_Raider_Blowback_AEG_Long_Desert_Tan/2621


http://www.pyramydair.com/s/m/Echo_1_Red_Star_AK47_RIS_Metal_Body_AEG/2307


http://www.pyramydair.com/s/m/Echo_1_Advanced_Squad_Carbine_HEAVY/2504


http://www.pyramydair.com/s/m/Elite_Force_4CR_AEG_Airsoft_Rifle/1997

http://www.pyramydair.com/s/m/Umarex_Elite_Force_M4_CQB_AEG_Airsoft_Rifle_Brown/2600


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