Chronoed it today............shooting 453 fps with .20's

I am going to put a m120 in it to drop the fps....the quad seal o-rings give lower differences between readings....instaed of each shot being different they were almost all the same

Congrats! So, which size (dasher #) o-ring did you get and did you get it for McMaster-Carr? How much quieter do you think it is?

453FPS on a M130 is not bad at all. Is the M130 hard to pull back? Why the change?
PDI makes spring that are, from what I've seen and heard, easier to pull due to their methods of construction. On the down side I have heard some iffy FPS readings from spring to spring, but mine came out just fine. A 170% would be fine for 380-400FPS. I'd imagine you'll be on the high side of that with your seals. I think Ehobbyaisa (the ebay store, not the website) sells them with free shipping.

Anyway, my $.02

mateba

my gun pulls back the m130 with ease....because of the src ultra torque motor and aim monster gearset and gaurder anti reversal latch.

the spring i have in it is a systema irregular pitch m130 i beleive

Yeah, I new that (well, not the "with ease" bit) but I was wondering why the change? I though you wanted a DMR.

after playing saturday with a 100 foot med and single shot ....i want to at least drop it down to 400-420 so i can have 30 foot med.....or maybe 400 full auto 30
foot

i do have to say i loved being able to cut through the brush with my shots............i got a lot of kills saturday

Yeah, I'd try for the high 390s and take advantage of a mean 30' MED.

I believe everyone needs to think aboutgetting quad seal o rings....i like the consistency in fps it gives you

some people have asked about the gearset in my gun....they are aim monster infinity gearset sold at evike.com

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$50...the piston broke but the gears are fine...i just put my g&g polycarb back in it

http://www.airsoftpost.com/product_info.php?products_id=29527
you can see the autoshim kit at the bottom of the page

did you ever put a 120 spring in your UMP?

not yet

I liked your UMP's performance last weekend. Nice job on the build.

thanks

yeah i just wish i didn't have to find screws for the gearbox. i tried to take it apart at the last wellington game to put in an m120 so i could have a smaller med and or full auto.well it stripped one of the hex head screws so until i get a replacement my gun is stuck at 100 foot semi auto.

Got my parts in today pics soon

low resistance wire set, screws, and m120 spring.

Also got a madbull short launcher with 120 shot grenade

got the gun back together. put the m120 in it. i moved the sling mount to the side and had to grind it down a little. i mounted the madbull launcher under the barrel. i am going to put a fresh coat of paint on the gun and then post some pictures. i know my gun isn't 100% realistic with the rifle scope and all but i dont have the $ for a real acog and the mock ones dont work that well. i havent chronoed the gun yet but i believe it is shooting in the 380-420 range. once the spring gets settled in it will be better.

did a new paint job on the ump. pics soon.

also purchased an extra high cap magazine and magazine clamp.