The SIG SG 510 or Sturmgewehr 57 is a selective fire battle rifle manufactured by Schweizerische Industrie Gesellschaft (now SAN Swiss Arms) of Switzerland. It uses a similar roller-delayed blowback system to the H&K G3 and CETME rifles. It also has a SAW counterpart akin to the American Stoner 63.
The Sturmgewehr 57/SIG SG 510-1 was adopted for Swiss military service in 1957 and has been replaced by the lighter SIG SG 550 in 1990, although some reservists used it several years longer.
While the actual weapon itself may be easier for enforcers to control, its actual accuracy quickly diminishes over long range and firing at full auto making it a weapon difficult to control.
Attachments that help the SG510's overall would be heavy barrel and an angled grip to help manage the actual weapon itself, AP tracer rounds can be a life saver whenever forced into close quarters if put up with a mechanic with armored insert.
Its actual hipfire is very comparable to the FN FAL, even though the lower rate of fire doesn't help as much in close quarters