Hi being quite new to air-soft I feel really stupid having been conned by a shop that described the gun I loved the feel of as display only not skirmished. The gun was not at all as described as I found out later. the alarm bells should have rung when the shop failed to find its box but found a box from the same make but different model. So I bought new lipos to suit the gun did not check that the lipos in the boxes where as described on the box in the shop, can you see where I going here should have been 7.4 x 1100mah got one new battery that size and one used 7.4 1400mah AAAAAAAAh. So back to the gun which was shooting a poor 312 fps ohh I thought comes with spare spring must be the 90 spring fitted not the 120 so I did the one thing I should not have done and started to strip the gun to access the gearbox enter and convert spring change.undid grip end cover to find exposed bare wire going to motor where some bright spark had changed a motor terminal by baring the wire soldering a used terminal on and not fitted any shrink tube over the repair. Took off motor and grip. removed upper body by removing relevant pins found rear pin very worn and chewed up. Obviously removed stock tube and took out gear box took out spring which turned out to be the original 120 spring which was much stronger the the spare new spring so refitted all and took it back to the shop. the shop owner was obviously aware of the guns history and the owner said you have invalidated the warranty but we will have our gun tech look at it. What comes next is no surprise I am blamed for the dodgy repair so no refund. The name of this wonderful shop is A2 Supplies of Reading. Oh and the batteries I must have swapped con man.