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yes it uses AR style mags (magpul pmags or lancer mags) you can add a foregrip as the OAL is 27.5 inches "unless your AR pistol has an OAL greater than 26 inches then you should not add a vertical fore-grip unless you first submit a Form 1 and get it approved." Specifications and features: Kel-Tec RDB Semi Auto Rifle RDBBLK 5.56 NATO (Accepts .223 Remington) 17.3" Barrel Twist Rate 1:7" 20 Round Magazine AR-15 Compatible Magazine Trigger Pull 4.5-5.5lbs Bullpup Design Ambidextrous Controls Sling Points Reversible, Non-Reciprocating Side Folding Operating Handle Short Throw 35 degree Safety Selector Reinforced Steel Top Cover Ambidextrous Bolt Release Synthetic Stock Overall Weight Unloaded 6.7lbs Overall Length 27.3" Black Finish

Any AR magazines will work. If you have an AR-Pistol with an overall length of 26" or under, then you can't add a foregrip. However, if your pistol is greater than 26", you can add a foregrip because it's then considered a "firearm". Interesting.