That?s actually pretty reasonable for a drum mag. HKParts is asking $200 for an MP5 drum and $220 for a Colt pattern 9mm AR drum.
No, drums aren?t cheap or practical. But they?re fun. I have several backloading drums for AKs, the D60 AR drum, a Korean Glock 9mm drum, the GSG 110 round .22lr Ruger 10/22 drum, and HKParts 50 round .22lr drum for my Beretta ARX 160.
The only one that isn?t reliable is the HKParts rimfire drum. It?s a Black Dog drum with a tower for the Umarex rimfire ARs like Colt, HK and ARX. Unfortunately, the follower and feed lips don?t match my factory mags and feed too low. These Black Dog drums seem to run fine in 10/22s but someone dropped the ball on the feed tower, I think they just used the same follower rather than redesigning it. So I?ll have to see a few positive range reports before I plunk down on one.
The FDE option is a nice touch...