Mid wipe, the box of semi bodies tends to fill faster than the box of rifle bodies. Road crates hand out the semi body early, while every AK still waits on its own rare part. The SKS turns that surplus into a Level 3 rifle, and its blueprint costs little scrap next to the assault rifle, so it is a sensible first buy at a fresh Level 3 bench.
Springs are the new cost. At Level 3 you can finally craft a metal spring yourself, but it eats HQM and scrap the AK would also like, so craft them alongside the rifles and keep every one that recycled guns hand back.
The mistake is habit. Once the SKS is learned, a body that goes into an SAR is a weaker rifle for the same scarce part. Leave the SAR to the teammate who dies on every roam, where its small HQM bill hurts least.
Questions
SKS ×10: how many resources?
High Quality Metal ×120, Metal Fragments ×2,000, Metal Spring ×20, Semi Automatic Body ×10.