Purchased from brenton direct - Brenton USA Long-Load AR-15 204 Ruger 17 Rounds Rifle Magazine

Great magazine for 204R. I purchased right from Brenton because OP was out when I was looking. Yea these are 17 rnd mags. You will need to remove the mag block upon receiving your order. And for general information if you read the description of all brenton usa mags it states clearly there is a 5 rnd limiter in them that can be removed. Now back to review. Great product. And definitely like the 2.315 internal dimensions. Standard 204R Max C.O.L is 2.26. I run a custom set up for heavier for caliber bullets and stretch my loads out a bit further for the 1:10 twist. Tho standard 223 mags work sort of the shoulder guide especially on Pmags drags on the longer 204R case. And messes with cycling reliably. So far with Brenton mags after a year and sveral hundred rnds through the mag and tube have had no feed or fitment issues.