It should take up about 4-5 slots.
These are made to fit onto standard Picatinny rails.
The Troy Modular Combat Grip will take up about 5 picatinny rail slots. So depending on what type of picatinny rail adapter you need, I recommend getting one with at least 5 slots. The one listed below will work for MLOK rails.
https://www.opticsplanet.com/leapers-utg-pro-m-lok-picatinny-rail-section-rejel.html
Thank you for your interest in our Troy Modular Combat Grips. Unfortunately, a CR2032 will not fit inside the grip. That being said, we are always looking for new development ideas and I've add this to the list for future consideration.
No. The Troy Modular Combat Grip mounts to picatinny rail systems not MLOK. However, you can use an MLOK to picatinny rail adaptor to mount the grip. Or, use a direct to MLOK grip. I will leave some examples and possible options below.
https://www.opticsplanet.com/trybe-defense-magnite-m-lok-picatinny-rail-section-3-slots.html
https://www.opticsplanet.com/magpul-mlok-hand-guard-mvg-moe-vertical-grip.html
https://www.opticsplanet.com/strike-industries-angeled-grip-w-cable-management-function.html
The Troy Modular Combat Grip will fit depending on what handguard you have. The Troy Modular Combat Grip mounts to a picatinny rail so it your handguard doesn't have a picatinny rail you can get a piece of picatinny that will mount to your handguard.
Yes, the Troy Modular Combat Grip can mount to the picatinny rail on the fore end of the shotgun.
Yes, a 18650 battery will fit in the Troy Modular Combat Grip.
The Full version being 4.5" should fit 2 CR123 batteries
Yes, this will be compatible.