S/A recoil spring in an SMG ????

[Villafuego]

Just picked up a boatload of parts, and looks like there was a recoil spring with the buffer contoured to it around the blocking bar.....Semi? aftermarket?

Seems a bit "stouter" than the average F/A spring......has anyone ever tried one of these in their SMG?

 

[RoverDave]

Back in the 1980's when full auto conversions were legal, people sold parts like that to go with slotted bolt conversions. I know Group Industries sold recoil springs like that. Other companies did too.

 

[Villafuego]

Gracias......about 2 minutes after I posted I remembered semi springs didn't have attached buffers.....

I'll throw it in this weekend and see what it does to my ROF......

 

[HKMP5]

I have one and it slowed Down my ROF