DFCO Magpul 10/20/30/40 Gen 3 PMAG 5.56x45 +2 Rounds Rifle Magazine Extension Black. Think again. Introducing the Dos Boot by DFCO an enhanced base plate upgrade for your Magpul PMAG GEN M3 AR15/M4 magazines. The Dos Boot adds +2 rounds of capacity converts your PMAG into a convenient monopod and improves grip for quicker smoother reloads. It's the unintrusive and practical magazine upgrade you deserve. We designed the Dos Boot with 20-round mags in mind aiming to get as low to the ground as possible without letting your rifle grip touch dirt. The result? A sleek extension that gives you a 10percent capacity bump better stability in prone and easier mag handling thanks to its contoured shape and aggressive tread. Though originally designed for 20-rounders the Dos Boot is right at home on 10 30 and even 40-round magazines. It s versatile practical and just the right amount of extra. Specifications for DFCO Dos Boot +2 Magazine Extension Compatible W/Magpul PMAG: Manufacturer: DFCO Fabric/Material: Polymer Features of DFCO Dos Boot +2 Magazine Extension Compatible W/Magpul PMAG:+2 Magazine CapacityTool-less drop-in replacementImpact resistant injection-molded polymerAggressive tread for solid contactConvex shape for smooth positional adjustmentsImproved grip surface for confident handlingCompatible with Magpul PMAG 10/20/30/40 GEN M3 Magazines Package Contents:DFCO Dos Boot +2 Magazine Extension Compatible W/Magpul PMAG DFCO CARTON-10-BOOT-BLK: Magpul 10/20/30/40 Gen 3 PMAG 5.56x45 +2 Rounds Rifle Magazine Extension Black