S+1 Handguard If you are interested in

If you are interested in making your housing FRT compatible

the ID can be reduced to about 1

so use of a suppressor

you can select those options also under the Shop tab at the top of your screen

S+1 Handguard If you are interested inExtended Handguard for MP5. Made from durable polymer HP MJF PA12. Provides 25. 5 M LOK slots, including a full 5 PIC slots in front of the Sight Tower to accompany most Pistol Weapon Lights. Very lightweight. Extends . 97" past stock muzzle, so use of a suppressor, linear compensator, or blast forward device is REQUIRED! Inside Diameter is 1. 55". When using the far mlok slots, the ID can be reduced to about 1. 4". Includes mounting hardware. Torque