Details, The KWA Magpul RM4A1 Electric Recoil Gun has a kinetic feedback system (KFS) to give recoil after every shot fired. This has a full metal alloy flat top upper receiver and a full metal lower receiver with an adjustable 2G high performance bucking hop-up. This also has a mechanical / electric cut off system to stop the gun firing after the last shot is fired (Only works with the KWA RM4 magazines). This is also rear wired so takes a normal crane stock battery. This fires in semi or fully automatic at upto 350 fps. Please note as with all high qulity AEGs this does not come with a battery or charger. If you require a battery or charger they can be found in our accessories section. You MUST be 18 or over to purchase this. Please note this is a VCRA applicable Realistic Imitation Firearm. You must be UKARA registered (or have a defence under the VCRA) to purchase this as is, Please contact us or state your UKARA registration number in the comments box when you order. If needed we can spray this for you (at an extra cost of £15.00) so that it meets the requirements to allow anyone over 18 to purchase this. Please select this option from the menu above.