The price on almost all GBB mags ends up kind of horrendous, however, if you're like me, you'll enjoy the realism of carrying a GBBR enough to at least get a few lol. If you're looking for a budget GBBR, you can get an ACM like I did ($200 on airsplat) or a Well (not sure how the quality holds up next to an ACM) and with a few minor upgrades and some proper magazines, you'll be up and running in no time! I've been working with the WA M4 platform for about 3 years or so now, so if you have any questions, feel free to drop me a PM!