FSB's in 2020?

**Diamondback** · 08-07-20, 16:53

Originally Posted by justin_247

For folks who are running an FSB and laser aiming devices, what kind of setup are you using?

I ask because when you're running an FSB, you give up several inches of top rail and the setup can feel a bit tight...

For a "Mk 18-ish" with CASV, I slapped a Mossie Mount onto the front frame. Upside-down Lasermax on the Mossie, skinny MFT/Princeton light on top of the laser. It does help to note that there's a blast shield going around the FH to protect the electronics...

**titsonritz** · 08-07-20, 17:00

Originally Posted by Eurodriver

Centurion FSP rails.

Yep, I also have DD M4A1 RIS II FSP

**Diamondback** · 08-07-20, 17:02

There's also the old KAC MRE, but good luck finding one...

**Disciple** · 08-07-20, 21:45

Originally Posted by Diamondback

For a "Mk 18-ish" with CASV, I slapped a Mossie Mount onto the front frame. Upside-down Lasermax on the Mossie, skinny MFT/Princeton light on top of the laser. It does help to note that there's a blast shield going around the FH to protect the electronics...

I searched "Mossie Mount" to see what you were describing and I found this photo on the BCM website. Can the SureFire really take this? I note that you specifically mentioned a blast shield which I don't see here.

Arisaka-MT-1913-5__53281.1571674516.jpg

**Diamondback** · 08-07-20, 23:38

Originally Posted by Disciple

I searched "Mossie Mount" to see what you were describing and I found this photo on the BCM website. Can the SureFire really take this? I note that you specifically mentioned a blast shield which I don't see here.

Arisaka-MT-1913-5__53281.1571674516.jpg

IraqGunz, may he Rest In Peace, actually used to rock a full-on DBAL on a Mossie occasionally. By blast shield I mean taking a collar like an Indian Creek BFD and mounting it around the FH...

Red is the collar, blue is the muzzle device, light gray is the barrel and dark gray is the collar mount.

https://www.indiancreekdesigninc.com...read-protector

**Hammer_Man** · 08-08-20, 00:09

Originally Posted by Diamondback

There's also the old KAC MRE, but good luck finding one...

Brownell’s and Operation Parts has them on the regular.

**justin_247** · 08-08-20, 10:33

Originally Posted by Eurodriver

Centurion FSP rails.

Originally Posted by titsonritz

Yep, I also have DD M4A1 RIS II FSP

This is the answer I was expecting. I haven't noticed very many folks mount their laser in front of the FSP, though, so it still seems kind of cramped. Plus you get the increased chance of burning yourself on the sight post.

It's also interesting that people seem to have one of two reasons for preferring the FSP to a rail mounted sight.

(1) Due to zero shift when shooting irons.
(2) For redundancy, with little concern for zero shift.

When looking at rail mounted aiming devices, the two don't seem reconcilable outside of using a Mossie mount or something similar that directly mounts the aiming device to the barrel assembly. Or you need to have a monolithic upper assembly that uses flip-up barrel-mounted irons, like the Colt 6940 or SCAR, at which point you're running out of hand space really quick and likely need to consider using a VFG.

**justin_247** · 08-08-20, 10:46

The options that I see for folks who want to minimize zero shift with both fixed irons and an aiming device are the Mossie mount and Ergo forward rail:

Ugly. But I suppose that's a secondary concern for such discerning individuals.

I almost forgot, you could run a clamp-on front sight:

I hope this exercise was useful for folks other than just me.