Bipods and grip pods
Grip pods: pistol gripped bipods These attach to a Picatinny railed forearm, such as commonly found on AR15 and M4 type rifles.
Harris-type bipods These attach to a sling swivel stud.
Picatinny rail bipods These attach directly to a Picatinny rail, such as on a rail-equipped handguard.
AR15 M16 M4 gun bipods, picatinny rail pods from UTG Tapco GMG, Grip Pods, and Mako Tpods.