FAQ: Will your CRG-15 grip work with a fixed stock such as an A2 stock, Magpul MOE fixed stock, ACE Skeleton stock, Magpul PRS, etc.?

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Yes, but not like what you might expecting or probably would hope for. Fixed stocks do not allow enough room to get your hand around our grip because of the way they meet up with the buffer tube and the back of the receiver.

No room for thumb. Fixed stock meets up with the entire back end of the lower receiver.
The Ace Skeleton Stock meets up with the entire back end of the lower receiver. No room for thumb.
Not enough room for opposable thumb to wrap around over the backstrap of the grip using this config.

You can use the alternate end piece that comes with the Magpul MOE fixed stock to get a “little” room for your thumb, but it is very tight and not ideal. See next image below.

Using Magpul Fixed Stock alternate end piece configuration to get a “little” room for thumb.

Our grip allows you to have what some people would call a “pistol style grasp” in that you can use your opposable thumb to wrap around the top of the grip. This is a photo from a customer using our grip with a Magpul fixed stock, but he modified the buffer tube so he could fix the stock further back and still wrap his thumb around it. See next two images below.

Modified buffer tube to “fix” the MOE fixed stock further back to allow more space for your hand.
Modified buffer tube to “fix” the MOE fixed stock further back to allow more space for your hand.
Modified buffer tube to “fix” the MOE fixed stock further back to allow more space for your hand.

Keep in mind that buffer end plates with sling mounts, etc. will also interfere with the placement of your thumb around the backstrap of the grip. You need that area clear. See next two images.

Sling mounts interfere with thumb and web of hand.
Sling mounts interfere with thumb and web of hand.

Custom castle nuts get in the way also.

Custom castle nut interferes with the web of your hand.

So in summary… If you want to benefit from a “thumb-over” hold, you will need a stock with some exposed buffer tube. On the AR-15 platform, you can wrap your thumb around the grip as long as you have the space available shown highlighted in yellow below. ie. exposed buffer tube with a pinned stock.

Exposed buffer tube with pinned stock allows room for thumb to fit over the backstrap of the grip.

Here is a video showing how easy it can be to pin an adjustable Magpul stock with just a paperclip. In the description of that video is a link to another good video showing two other methods.

Pin an adjustable Magpul stock… cheap and easy.

Please don’t hesitate to contact us if you have further questions!

Thanks, Sparrow Dynamics Team

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