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Old 02-03-2010, 10:20 PM #1
Join Date: Jan 2010
Getting consistent FPS from an 1998 Stock Autococker

Hello All,
I recently purchased an old 1998 Stock Autococker and I LOVE it! Everything appears to be stock (except for the trigger frame) and in good condition (this is my first cocker, so its possible I'm wrong).
It shoots pretty well, but when I chronoed the marker I noticed that it shoots between 260-289 FPS. Is there any way to get more consistency as far as FPS goes? I don't have a problem replacing parts, but I'd like to get a better idea of what parts should be replaced in order or priority. Any insight you people could give me would be greatly appreciated. Thanks in Advance!
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Old 02-04-2010, 09:35 AM #2
Join Date: Jan 2010
I posted this on another forum and they asked a few questions so I'll post the responses

I'm using a 5-pc barrel kit and compressed air.
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Old 02-04-2010, 11:24 AM #3
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5-pc barrel kit?!?!?!!?!

Clean and lube regulaor, otherwise, get a new one is all i can think of. What kind of tank are you using? crossfire, dye, etc.
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Old 02-04-2010, 07:17 PM #4
Join Date: Jan 2010
Its a no name tank...Pure Energy something or other...I'll try your suggestion next peaches and see if I get anywhere.
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Old 02-04-2010, 10:33 PM #5
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If your reg isn't making it consistant, its probably time to replace the springs.
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Old 02-09-2010, 09:24 PM #6
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Make sure you are using good high quality paint when you chrono...using cheap paint can cause fps inconsistencies which are sometimes mistakenly blamed on the marker.
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Old 02-10-2010, 05:22 PM #7
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Location: Cincinnati, OH
Also to add about paint - with an autococker always make sure the barrel is level or slightly pointing up while chronoing, especially if you don't have a great paint bore match with the barrel.
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Old 02-23-2010, 06:30 PM #8
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underbore and see if you have as many problems bc its prolly from roll outs
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Old 02-25-2010, 12:42 AM #9
Join Date: Mar 2009
Yep. All good info. I still shoot a 98 I've had since it was new. I get +/- 5 fps. Like they said, paint barrel match and a quality, maintained reg are typically the most important.

Also, if it is stock, you are going to want to pull the valve and lube it, and probably get a spring kit to replace the valve spring and mainspring. This will have a noticeable impact on your velocity consistency. Also make sure your hammer is adequately lubed. These steps will make sure that the valve gets struck with nearly the same force every time, and stays open the same amount of time every shot. The impact on velocity should be obvious, but this is an often overlooked issue.

If this is your first autococker, you may not be familiar with how to remove the valve. Google it, search here, there are guides around. Note, you don't need a valve tool per se, and can use the proper size allen wrench ( forget what size, but you can look it up), but it's good to have around. I made my own by using a dremel cone-shaped grinding tip and boring out the end of the allen key. Look at a picture of an actual valve tool and you'll see what I mean.

Enjoy it man. You'll probably want to upgrade it at some point. The most bang-for-the-buck upgrades will be a shorter throw 3-way, new ram (mp4 is nice and you can find them relatively cheap sometimes), and a roller sear. This will give you a much nicer pull and smoother action.
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Old 02-25-2010, 03:00 PM #10
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Try another inline regulator. My 98 went from +/-20 fps (stock inline reg) to +/- 5 (AKA Sidewinder).
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