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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles.

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  #1  
Old 05-09-2010, 11:11 PM
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Default I modified my FN SCAR lower receiver to accept standard pistol grips

If you don't know, FN accidentally used the wrong pistol grip specs when they created the mold for the lower receiver. If you want to use a pistol grip other than the one that comes standard you must either modify the grip or modify the lower receiver. Tonight I modified my lower receiver.


This is the pistol grip mounting point on the SCAR. The black line is the material I need to remove to get it to the standard pistol grip spec.









This is what happens if you install a standard pistol grip to a SCAR:



At this point I used a Dremel and a file to remove the excess material from the mounting point. I was rather meticulous so the process took me a little more than an hour. I used the Dremel to remove most of the material, but it isn't possible to get the surface perfectly flat with a Dremel. The file allowed me to get the surface perfectly flat. The black marks from the permanent marker was crucial for monitoring my progress. I absolutely did not want to remove too much material or change the angle of the mounting point. As I got close to the standard spec I kept trying the Hogue grip to see how close I was.

(Side note: The cheap POS A2 grip that comes with a normal lower parts kit fit with very little modification. I am certain they do not internally mate very well with the mounting point, not that it matters.)
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Old 05-09-2010, 11:11 PM
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All done.




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  #3  
Old 05-09-2010, 11:13 PM
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great job! also, it looks like your stock scar grip will still fit even after the modification.
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Old 05-09-2010, 11:13 PM
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Scared me a little when you said "Dremel" but good job!
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Old 05-09-2010, 11:14 PM
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Interesting project. Was the original grip that bad to go through all this? I might have tried modifying the grip instead to keep the SCAR more or less intact.
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Old 05-09-2010, 11:23 PM
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Quote:
Originally Posted by Ishoot View Post
Interesting project. Was the original grip that bad to go through all this? I might have tried modifying the grip instead to keep the SCAR more or less intact.
It took me 4 months to build up the nerve to do this project. I modified a Hogue grip 2 months ago for the exact reason you mentioned. Modifying an expensive rifle is usually a project for the stupid or crazy. The original grip works fine. It's just a $3 brown A2 grip that fits the stupid FN lower (and for some reason it has a hole for the spring that pushes against the selector detent in an AR-15). But I want to be able to use whatever grip I please.

After researching this issue I found that a number of people have done this. As you can see there is plenty of material left after the modification. I also figured that the lower receiver on the SCAR is just another part. It doesn't have a serial number or anything special. It could be replaced for a few hundred dollars if I every felt the need.

Last edited by Toolbox X; 05-09-2010 at 11:28 PM..
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Old 05-09-2010, 11:28 PM
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I am scared ****less of modifying stuff myself. Damn good job
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Old 05-09-2010, 11:31 PM
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Thumbs up

Nice job!
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Old 05-09-2010, 11:33 PM
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I didn't know SCAR receivers were plastic. Now I don't know if I want one.
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  #10  
Old 05-09-2010, 11:41 PM
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I'm a little confused, I'm able to install a standard AR15 grip onto my SCAR lower without any modification, same with magpuls. I could be wrong but I'm willing to bet it's the hogue grip that's out of spec not your SCAR.
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  #11  
Old 05-09-2010, 11:48 PM
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Quote:
Originally Posted by darkest2000 View Post
I'm a little confused, I'm able to install a standard AR15 grip onto my SCAR lower without any modification, same with magpuls. I could be wrong but I'm willing to bet it's the hogue grip that's out of spec not your SCAR.
It's not the grip that is the problem. Look at the pictures in my post and you can see exactly how out of spec the SCAR grip mount is.

This is an issue that is well known and documented. People were hoping it would be corrected with the Black SCAR 16S rifles, but it wasn't.

It's true that every model of pistol grip is slightly different inside. As I said, a POS A2 grip had MUCH looser tolerances than the Hogue grip. I have never heard of a Magpul grip mounting without modification. Do what I did with a piece of paper or cardboard and see how close to spec your SCAR PG mount is. Maybe you got lucky, but my guess is something else is going on.
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  #12  
Old 05-09-2010, 11:56 PM
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My pistol grip stud looks exactly the same as your unmodified one. I haven't tried anything else other than magpuls and standard AR15 grips so...

The standard grip I used is from DPMS if that matters, not exactly some "POS" grip.

Either way that looks like a clean job.
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Last edited by darkest2000; 05-10-2010 at 12:00 AM..
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  #13  
Old 05-10-2010, 12:08 AM
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very nice job.
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  #14  
Old 05-10-2010, 12:13 AM
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Quote:
Originally Posted by darkest2000 View Post
My pistol grip stud looks exactly the same as your unmodified one. I haven't tried anything else other than magpuls and standard AR15 grips so...

The standard grip I used is from DPMS if that matters, not exactly some "POS" grip.

Either way that looks like a clean job.
Post pics of what your grip looks like when its on and how the lower looks when you remove the grip please.

Great work OP
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  #15  
Old 05-10-2010, 12:29 AM
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Here's what it looks like...




It also appears that FN evidently used M16A2 grips on the SCAR since you can see it has the selector detent spring hole that the SCAR does not utilize.

Not looking to debate, just basically confused by all this.
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Last edited by darkest2000; 05-10-2010 at 12:34 AM..
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  #16  
Old 05-10-2010, 12:33 AM
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darkest2000,

Thanks for the pics! The POS $2 A2 pistol grip I was referring to actually was from a DPMS LPK It definitely has wild tolerances internally compared to the Hogue. Do you have another grip such as a Magpul you can try?
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Old 05-10-2010, 12:42 AM
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Quote:
Originally Posted by Toolbox X View Post
darkest2000,

Thanks for the pics! The POS $2 A2 pistol grip I was referring to actually was from a DPMS LPK
Well that explains it

But then that also means the factory FN M16 grips are "POS" since they both appear to have the same "depth" (see my pic). FN obviously dimensioned their lower to work with their A2 grip. I tried two other standard A2 grips and those fit as well, not sure who made them I thought they're all the same. Maybe FN and DPMS used the same molder to make their grips?

Sorry I don't have my Magpul to try on I sold it already.
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Last edited by darkest2000; 05-10-2010 at 12:44 AM..
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Old 05-10-2010, 12:43 AM
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Darkest2000 ty for posting pics. It appears your grip fits perfectly. Toolbox, its odd yours doesn't fit flush.
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Old 05-10-2010, 12:45 AM
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Toolbox, take a picture of the hogue grip from this angle

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Old 05-10-2010, 12:49 AM
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I think I would have modified the pistol grip, waaaaaay cheaper to fix
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Old 05-10-2010, 12:58 AM
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Ok just tried a Colt M16A1 grip and this one also fits flush.


This is just a guess but evidently some aftermarket grip makers took their measurements straight off of AR15 lowers, which is designed to leave a small gap between the stud and the inside of a milspec grip.

FN on the other hand dimensioned their lower to leave no gap on the inside when fitted with a GI spec grip. Combine the two facts and you'll get none fitting aftermarket grips.

This is purely speculation and until today I had no idea FNs had spec'd their lowers different from standard AR lowers. Surprising consider they also make M16s for the U.S.Gov't. Learn something new everyday.
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Last edited by darkest2000; 05-10-2010 at 1:03 AM..
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Old 05-10-2010, 1:01 AM
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Originally Posted by Bobula View Post
I think I would have modified the pistol grip, waaaaaay cheaper to fix
Actually, if cutting the lower means it'll now accept ALL the grips out there on the market today I probably would've done it that way as well, the more parts my gun is compatible with the better it is.

It's not like you're cutting a critical area either, even if you mess up a little it won't affect the appearance since you can't see it anyway when the grip is put on.
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Old 05-10-2010, 1:09 AM
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I've been tempted to do this as well. The TangoDown grips don't come close to fitting. My Magpul is close but still needed some dremel work. Mine's a black 16s and it's still out of spec.
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Old 05-10-2010, 1:16 AM
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Nice work Toolbox.

Thanks for sharing.

I will do the same to my Black SCAR when it arrives.
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  #25  
Old 05-10-2010, 8:23 AM
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I think you guys have figured out what happened in the FN enginerring department. I speculate FN based the dimensions of the PG mount on the internal dimensions of a A1 or A2 grip instead of the dimensions of the mount area of an AR lower receiver (or any other make and model of rifle that accepts AR pistol grips).
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Old 05-10-2010, 11:25 AM
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Nice right up man! Will definately use this method if I end up purchasing a SCAR.
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  #27  
Old 05-10-2010, 12:08 PM
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Grant's gotta lotta skills in this area.
Unless you're comfortable with tool work and have his IQ, I'd use extreme caution (i.e, send it to a smith).
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Old 05-10-2010, 1:30 PM
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Dremel?! File?! You should have chucked that thing up in your mill !!

Regardless, it came it very professional looking.
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Last edited by ohsmily; 05-10-2010 at 1:59 PM..
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  #29  
Old 05-10-2010, 1:48 PM
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Very nice work! Can we get a more zoomed out shot of the rifle to see how it looks with the new grip on it?
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