I just finished my first Saiga conversion on my .308 thanks to plenty of threads here, youtube videos, and CSS / Amazon for parts. I used a modified Tapco G2 trigger group, Tapco stock, and a Hogue grip. Just some things I've noticed with my gun that I didn't see in some other threads about conversions.
1. I didn't have the rivets in the side of the gun for the original trigger. This also means that I didn't need to buy hole plugs.
2. My gun had the square hole for the pistol grip nut. I was prepared to cut my own but this must have saved me at least an hour.
3. Instead of having three rivets for the original trigger guard I had one rivet at each end and what appears to be two tack welds in the middle. Those two welds were the most time consuming to remove and grind flat. A dremel should be mandatory to do this job properly.
4. CSS said that new holes needed to be drilled for the trigger guard and they were right. Both front and rear needed to be drilled. Conveniently there was a hole in the original trigger guard which didn't go through into the receiver showing exactly where the stock hole should have been. I just marked it and drilled it.
5. I needed to trim the trigger guard for the bolt hold open to fit. I notched one corner about 1/4".
6. Definitely trim the BHO. I cut off maybe 1/8" (just guessing) and wish I went further.
7. My safety lined up and works perfectly. No need to extend it or grind it. I saw this pinned in the .308 forum and was dreading this problem.
Overall I'm very happy with it and can't wait to take it to the range. I wish the Tapco stock was a bit longer since the gun is just over 3" shorter from the stock configuration. The Hogue grip feels great and was certainly worth the $20 for me. If anyone else is looking to convert their .308 I'd say check for the spot welds and side rivets and adjust your plan accordingly.