-60 round drum-For 5.56x45 NATO/.223 Remington*-Next-generation impact & crush resistant polymer construction-Wide compatibility with most'STANAG 4179' platforms such as the AR15, M4, M16, SCAR MK16/16S,HK416, MR556, M27 IAR, IMI Tavor, & others-Will seat fully loaded on a closed bolt-Bolt hold open feature to lock the bolt back on the last round**-Ratcheting Loading Lever to take tension off the spring for easy loading by hand-Feed Tower compatible with most loading devices, including USGI stripper clips & guides, theStripLULA™, and others-Designed to be left loaded for long term storage without any loss of function or degradation-All components used are corrosion resistant-Easy to disassemble for cleaning with only a flat-bladed screwdriver or similar-Anti-glare translucent window on rear of drum allows for easy determination of rounds remaining-Paint pen dot matrix panel on back of body to allow for identification marking-Slip-on, semi-rigid Dust Cover prevents grit & debris intrusion during storage & transport*Optimized for use only with 5.56x45 NATO/.223 Remington cartridges.Use with other calibers such as .300 AAC Blackout is not recommended.**The D-60 is designed to lock the bolt back after the last round for most AR15/M4/HK416 platforms. Inserting an empty magazine & manually cycling the charging handle will not activate the bolt hold open feature. In addition this feature may or may not work for weapons with bolt hold open levers that don't adhere to the Colt-spec.
Determined at checkout.