will Quick Detach Accessories will leave marks on the Rails?

[militarymoron]

Bobro and ADM are examples of mounts that utilize springs to keep tension on the rails.

that's not true. the springs (on the ADM) are in compression, not tension. they're there to push against the clamp portion and keep it open so it's easy to remove and install the mount to the rail. the mount would still function if you removed those springs. it's the crossbolt that provides the tension keeping the mount on the rail (applies to ADM).

bobro and adm mounts are also friction mounts (as are all mounts that clamp to a rail). they rely on the friction between the clamp and the rail to keep the mount from moving within the travel of the rail slot. the reason they won't mar the finish as much has nothing to do with the springs, it's just because of the larger surface area of the clamp, and the fact that it's not camming/rubbing against the rail as tension is being applied.

[kwrangln]

that's not true. the springs are in compression, not tension. they're there to push against the clamp portion and keep it open so it's easy to remove and install the mount to the rail. the mount would still function if you removed those springs. it's the crossbolt that provides the tension keeping the mount on the rail.

bobro and adm mounts are also friction mounts (as are all mounts that clamp to a rail). they rely on the friction between the clamp and the rail to keep the mount from moving within the travel of the rail slot. the reason they won't mar the finish as much has nothing to do with the springs, it's just because of the larger surface area of the clamp, and the fact that it's not camming/rubbing against the rail as tension is being applied.

The Bobro mount has no cross bolt, and will not work without the springs. The lever compresses the two springs which then transfer that force to the block that engages the rail. That is how the mount self adjusts for different rails.

See the pic for details.


As for one type of QR mount being a friction mount and other not, sorry, but they are all using friction to retain the mount to the rail in some form or another. The difference is wether they are using a sliding force to compress the rail or strictly compression.

[militarymoron]

thanks for the correction - about the bobro springs/lack of crossbolt. post corrected above.

[Robb Jensen]

Many mounts leave marks.

These are firearms and get scratched just like a carpenters hammers or mechanics wrenches do.

[RobMoore]

A well-worn rifle is a well-tested rifle. The scope-mount marks should be the least of the "character" on a trustworthy weapon.

I like to say the same about my handguns. A pistol without holster-wear hasn't earned its keep yet.

[boltcatch]

If you have a need for such extreme accuracy (and the ability to shoot well enough to use it) that rail marks from a LaRue mount are a concern, then you're most likely talking about a weapon that either does not have a QD mount in the first place or one where you're not going to be moving the optic much.

Is anyone seriously suggesting that LaRue QD mounts are not proven performers?

[QuietShootr]

If you have a need for such extreme accuracy (and the ability to shoot well enough to use it) that rail marks from a LaRue mount are a concern, then you're most likely talking about a weapon that either does not have a QD mount in the first place or one where you're not going to be moving the optic much.

Is anyone seriously suggesting that LaRue QD mounts are not proven performers?

Yes, a ****ing airsofter...which we seem to be asshole-deep in lately.

[Skunkworks]

Just bought a LaRue LT-110 for my new M&P15R and saw the mark on the rail and didnt care or give it a second thought about it.Its doing its job being secure is why the mark is there.Jmho

[Skyyr]

Yes, a ****ing airsofter...which we seem to be asshole-deep in lately.

I'll relay your comment to the tech guys at Schmidt & Bender. Apparently their expertise designing and then mounting $3,000+ optics to rails is no better than a, quote, "effing airsofter."

Gee, six years of formal German engineering training and another four of apprenticeship and all that was actually needed was a keyboard and an opinion.

[Skyyr]

that's not true.

bobro and adm mounts are also friction mounts (as are all mounts that clamp to a rail). they rely on the friction between the clamp and the rail to keep the mount from moving within the travel of the rail slot. the reason they won't mar the finish as much has nothing to do with the springs, it's just because of the larger surface area of the clamp, and the fact that it's not camming/rubbing against the rail as tension is being applied.

The Bobro does not rely on friction - the bar underneath has a flexing appendage that compresses when it fits between the picatinny slots and maintains compression until removed.

Your assertions about the ADM are correct. I meant to correct that after I posted it, but forgot to.