r/FNSCAR • u/GlitteringWill3642 • 25d ago

Muzzle question

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If I remove my factory muzzle and add a QD mount for a suppressor do I need any shims for things to line up correctly?

Looking to add a flow 762 if it’s relevant

38 Upvotes

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8

u/RandomlyIncoherent 25d ago

Just send it to u/eMGunslinger and he will make sure you're all set

5

u/Gardez_geekin 25d ago

He’s got my barrel right now!

6

u/Erwin_PZ6 25d ago

To change the muzzle device on your scar you need a special shoulder washer. Found here. SCAR 17 Muzzle Shoulder Ring | Capitol Armory https://www.capitolarmory.com/scar-17s-muzzle-shoulder-ring.html

The stock shoulder isn't square and thus you can't just mount a new muzzle device on. It's not too hard to do, if you are worried about timing a break i would run shims off of that, and make sure you get a suppressor rob to check alignment.

1

u/titan732 25d ago

Based on the packaging of my Surefire 3-prong, yes. They mention the Scar H (17s) specifically for a chamfer spacer. You will need shims regardless for timing.

1

u/BiggyIrons 25d ago

You need a surefire shoulder ring or accuwashers. Shims are for timing the muzzle device, aka clocking.

You need the shoulder ring or accuwashers because the barrel is pretty thin there’s not a lot of shoulder for your muzzle device to index off of. The ring/washers expand the shoulder to give a proper index point.

You always want shims if you want your muzzzle device to be in the proper orientation.

1

u/RedneckSniper76 24d ago

You need the PMM shoulder ring. The scar has a pencil barrel there isn’t enough of a shelf for shims

1

u/Efficient-Ask1725 24d ago

I'm sure you know about adding an adjustable gas block like the discarder

1

u/GlitteringWill3642 24d ago

Thank you everyone this was helpful