Quote:
Originally Posted by Skladfin
prom hard and madbull hop up rubbers both cause jamming and feeding problems in alot of guns.
Not sure why the madbull does but the prometheus has an incredibly fat lip, so the BBs can't go through.
Systema hop up rubber is the safest way to go.
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Thats too bad that your guns have jammed with using those hop up rubbers. I have to this day not had one jam since switching to those hop up rubbers, I've had them in the guns for alittle over season and a half now. Great product