Atlas Custom Works B-31L Sport AK Gas Tube Cover for B-10L Sport Handguards, Desert Tan

You've got a 5KU Sport AK and you want more optic options without drilling your receiver. The B-31L Sport does exactly that by replacing the standard gas tube cover with a full-length rail. You get a Picatinny sight base running along the left side of the handguard, which means you can mount a red dot straight on, run an offset at 45 degrees, or just keep your iron sights and enjoy a cleaner profile.

It's aluminum alloy in desert tan, and it ships as a single piece — the gas tube cover with the rail already cut in. No extras, no hardware, no optics. You'll need your own screws or brackets to mount it to the B-10L Sport handguard, and you'll need your own offset mount if you want dual-coincident aiming with a red dot and a backup iron.

Compatibility is specific. This is built for the 5KU B-10L Sport handguard and the DL-1 handguard extender. If your handguard isn't a 5KU B-10L Sport or a DL-1, it isn't going to seat right and forcing it will only ruin the fit.

For a 5KU Sport build, this is the cleanest way to add optic space without touching the receiver. For anything else, it's just a paperweight.