The SRS Universal Pic rail is designed to allow flexible mounting with 1/4-20, 10-32, and M-Lok fasteners.It can be used with a standard sling stud and also has an integrated flush cup for QD options.
Short
Overall Length:4 in.
Bolt Spacing:1.25 in – 2.5 in.
Weight:.6 oz.
Long
Overall Length:4.25 in.
Bolt Spacing:2.5 in – 3.25 in.
Weight:.65 oz.
SRS Universal Picatinny Rail