These are for current production MK22/MRAD rifles with the mlok forend. The old rifles with circular holes are not compatible. 

**Rear Fixed Barricade stop not included

Introducing the ARCALOCK Dovetail Rail System *Rail is only locking with an Area 419 clamp*

Rail Features:
– Serrated rail sides interface with our proprietary clamp design to mechanically lock it in place so no movement is possible.  Serrations are not sharp will not damage bags or your hands.
– Rail is backwards compatible with standard Arca accessories but will not be locking without our clamp
– Rail is specifically built to run the full length of a new Barrett MRAD forend stopping right at the end of the handguard.
– Made to the RRS 1.5″ Dovetail Standard so you can be sure lever clamps will work
– No sharp edges. Every corner is radiused and every edge is chamfered on the machine. This takes longer to make but it is the only right way.
– Designed to attach to the rifle up to 4 places for maximum strength and stability.
– Type 3 Hard Coat anodized in FDE for additional durability.
– Made from 6061-T6 Aluminum
– Made in-house here in the USA from USA sourced Aluminum