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Kinetic Development Group Modular Receiver Extension, Compatible w/ all 7.62 & 5.56 SCAR Model
If you're referring to the 4.9 and 6.5, it''s the length of the accessory rail, and the number of slots - click on the photos and you should be able to see the difference - 6 slots vs 10 slots.
The difference is that the MRX5-110 uses a "industry standard" modular system whereas the MRX5-120 uses the Magpul M-Lok attachment system. If you are looking for the M-Lok rail is it MRX5-120.
Let's face it, the factory foregrip for the SCAR leaves much to be desired. While the price for the KDG MREX seems a bit high, it turned out to be well worth it. The MREX significantly improves the feel of the SCAR while adding plenty of Mlok slots...
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The 6.5" is great, as others have noted. Don't forget your torque limiter. OP has the FIXIT one here and was the best value and precision I could find for this job. Also, if you have any muzzle device, make sure it will fit THRU the MREX before yo...
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I have owned my Scar 16 for over seven years now and I've always struggled with the aesthetics of it. Well, I believe this is the ultimate solution for anyone's ugly duckling.
The ACR buttstock gives a much more clean look to the Scar. Fortunately, ...
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The extended rail is by far the best looking aluminum rail you can. It! Easy installation and make a night and day differance!!the weight is unnoticeable at 3 oz. you won't be dissapointed. I used a heat gun for my original hardware and used the YouT...
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this is my 2nd installation of this rail on a SCAR and both times it required the receiver be slightly drilled out to not strip the screws. Once installed a great product but i don't recommend modifying your receiver to install it.
As advertised, it only adds 3.6oz (that’s the longer rail too) to the guns weight. Construction looks very solid and well made. Comes with everything needed to install (torx wrenches, vibratite). Highly recommended.
Product Info for Kinetic Development Group Modular Receiver Extension, Compatible w/ all 7.62 & 5.56 SCAR Model
If you're looking for more grip room and a better mounting platform on your SCAR rifle, equip the Kinetic Development Group Modular Receiver Extension. These durable and lightweight Picatinny Rails by Kinetic Development Group utilize a one-piece design for maximum ruggedness. The Kinetic Development Group SCAR MREX even allows you to remove the barrel while the extension is still attached, making on-the-fly customizations simpler than ever. You can equip this extension on all 7.62 and 5.56 SCAR models, and they're crafted from tough 6061-T6 aluminum. Adding on this extension also improves the balance of your rifle as well as weight distribution. Gain enhanced modularity and a better gripping platform while reducing your rifle's profile with the KDG M-LOK SCAR MREX.
Features of Kinetic Development Group Modular Receiver Extension:
Simple, durable, and lightweight
One-piece design
Allows for removal of the barrel with the extension still attached
Reduces the profile of the factory SCAR platform
Works on all 7.62 and 5.56 SCAR models (Minus the 10.5in SCAR 16 Models)
4.9 in. added modular rail space from front of SCAR receiver, for use with any SCAR L & H barrel configurations. (certain Flash hiders and certain suppressors will not fit.)
Package Contents:
Kinetic Development Group Modular Receiver Extension, Compatible w/ all 7.62 & 5.56 SCAR Models