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5.56, 223, 300blk, 6.5 Grendel, 224 Valkyrie, 7.62×39, 458 socom, 450 Bushmaster, 6.8 spc and a ton of others, to many to list. I do believe you can do 9mm but would need to buy a magwell adapter so it can accept 9mm Glock magazines cause this is for rifle calibers and if you want to do 9mm it's just better and easier to buy a 9mm lower. This will take any AR-15 caliber, if you want Google AR-15 calibers and it'll show you about 100-150 calibers to choose from. Hope this helps.
Carmen, AR-15 Multi Caliber Stripped Lower Receiver - Caliber: .223/5.56, .300 BLK, 6.5mm Grendel, 7.62x39mm. Cheers and stay safe!
This lower is going to be compatible with ALL standard calibers of ARs except 308
- Caliber: .223/5.56, .300 BLK, 6.5mm Grendel, 7.62x39mm.
