Andrew, these hold 4 rounds.

Andrew, this holds 4 rounds of 6.5 Grendel. Hope this helps.

Andrew, 4 rounds Sir. Some options here : ammosc.com/6-5-grendel/

Yep concur 4 rounds these usually ship with similar guns I got a bunch of em, why only 4 rounds IDK... Btw there are larger mags like at this shop here midwayusa.com/product/1957592022 I usually buy only firearms here on Buds but by my accessories else where like Midway which is one of my favorites and no do not work there ; ). Stay safe!