About this 3D model

Adapter to replace the original stock with airsoft m4 style buffer tube, after this you can use whatever airsoft/real m4 style stock you want. Airsoft buffer tubes and rear stocks are much cheaper than real ar ones, and are still metal and usually same dimensions, so this is much cheaper but as good option for air rifles. Pretty much any common standard aeg buffer tube will fit, shs, specna arms, cyma whatever. Just make sure the buffer tube has those small dents in the connecting end, that you can see in the last picture. Those keep the stock from rotating, and they fit the dents that are on the adapter side. Adapter connects to the rear picatinny rail like original one. You can use stock screws for the base that are in the original rear stock. The buffer tubes connecting screw comes usually with the tube itself, but it is normally just long m5 bolt. There are m5 version and m6 version. This refers to the size of the buffer tube connector screw & nut. Pretty much all standard tubes come with m5 screw. You can also drill the buffer tubes original 5mm hole to 6mm, after this you can use the m6 version with long m6 bolt. M6 bolt supports the whole adapter even more. You will need one long type m5 or m6 nut (coupling nut) , which ever version you decide to print. This is pushed to the hex hole that is inside the adapter. Normal nut also works, long nut just makes the whole adapter more sturdy. Print it the bottom towards the plate like in the first picture, like this you get the most durable print. Models are pre-oriented this way. You need to use only small supports, just for the round connecting part that goes inside the tube. This is inside the tube, so you won't see it when assembled, so surface quality isn't big issue. Print with high wall count, 6 or more, and with high infill, at least 50%. The more you go, the more durability you get.