They are very good. i use them all the time.
Deinitely go for elite if your a long range. Cqb use the madbull
.25 Airsoft bbs can be good. Their weight is very good for accuracy and helps for a harder hit from the bbs. However, no bb is good if they are not high polish. Companies like Madbull and Matrix make good .25 bbs.
no.
The SG-S takes 6MM BB's. Walther, Crosman, Elite force or Bio bb are good.
The stinger p9 is good with .12 gram airsoft BBs or you can use .25 gram bbs but then it will decrease the range.
6mm
Creating a BBS from the Structural drawing is not at all a good practice. A BBS preparation without preparing the placing drawing will create lot of issues in fabrication, placing and steel saving.
The Nerf Elite is good product if you intend to modify it.
The Nerf Elite is good product if you intend to modify it.
bbs book
silver bbs
You search 'how do you calculate BBS' on google