I picked up a MRT bolt for the etha today. put a case thru it in the back yard. No issues. I used pathogen super grease . The spring doesnt even pinch close to popping the front bumper off.. Quieter sounding. FPS increase (279/280/276/283/283/282 to 294/298/296/297/296/295)..using the yellow hand held chrono. Little to no kick/vibration. For $52.99 . i think its a steal. now i was using field paint that i picked up a week ago. no breaks either. no wear or scratches. Will be using it again next sunday the 27th at the field. will try and get two cases thru it and see how she is after that.
before buying it i read everything online about pro and con's. some people getting awesome reviews and some getting horrible... i emailed and talked with techt about it. he insured me that all the new techt mrt bolts for the etha are the updated bolts and the issues were fixed. Only suggestion was to lube the bolt up but not cover.. just a light coat.
All in all i think this upgraded bolt is awesome. if i chop in the colder temps ill just simply switch back to the stock bolt or lower the dwell.. i usually play pump but figured id want to try semi this year. looking forward to putting a few cases this year thru this marker.