Many people ask what differences there are between an unmodified Saiga 12 and one that has been modified by a gunsmith to regain it's pistol grip and standard AK47 stock. Here are two Saiga 12 gauge AK47 style shotguns side by side. The one with the folding stock has been modified to have a pistol grip and standard AK47 trigger.
Two Saiga 12 shotguns
The modifications to the Saiga 12 require a few US made parts to be used on the new shotgun to remain 922r compliant. The US made magazine offers three US parts, the pistol grip and trigger group use another 4 US made parts, these pass the 922r test and a foreign made stock can be used. This example uses a Romanian wire side folder, US (Galil style) SAW grip, an AGP US made magazine and a Tapco trigger group.
The main modification is to remove the Saiga 12 trigger group and move it forward. This can be done at home, but a professional job by someone who's done it many times will result in a better looking finished product. The front ends can be modified, but it has not been done to this Saiga12
Here are two more pics of the Saiga 12s side by side