I bought an KWA SR10 recently and went ahead a bought these along with them. First of all these mags do fit for the KWA SR10 very well with little to no mag wobble in the AEG. Yes they are made of plastic but if you want to go for full metel construction you can spend the $30+ for the mags from KWA. I went for the least inexpensive buy. They are very decently constructed for plastic bodies. I dropped one from chest height with no significant damage to the mag. Also like some mag these tend not to feed the last few bbs into the gun. The only issue i really had with these mags were they type of ammo I was using. Use cruddy bbs and you WILL have issues with this mag, use quality bbs and they work just fine. The cruddy bbs i used were wallyworld brand .20 gram black bbs that were a dull black. They jammed in the mag and didn't feed properly into the gun. Also of note the same bbs didn't want to work in my regular cap P90 mag either with the same issues. I switched over after unloading these and started to use .20 gram madbull bbs and had no issues with these mags. Use quality bbs if you want these mags to work. Also using a little silicone lube wont hurt either. Overall these are fairly decent mag for a decent price.
Decent ammo load
Must use quality bbs
Not really a con but if you don't like a greyish mag these arn't really for you but if color doesn't matter then they are fine.
Rating: [4 of 5 Stars!]