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Old 07-04-2014, 06:08 PM   #1 (permalink)
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Hammer 7 questions

I'm looking at a hammer 7 for an inexpensive way to try out pump and magfed. I'm wondering if it likes co2 or air better, if co2 is the case what do you run on yours? 9oz, 12oz?
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Old 07-04-2014, 06:16 PM   #2 (permalink)
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I had heard CO2 was best for getting good FPS but it all seems to comes down the the regulator output if you use HPA, mine was well over 300 FPS on an 800psi output tank, all stock. I always prefer that option just for the convenience.
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Old 07-04-2014, 06:18 PM   #3 (permalink)
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It can run either fine but you will need a high output reg for HPA. It needs an input pressure of at least 800psi to work well.
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Old 07-04-2014, 06:23 PM   #4 (permalink)
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It depends on luck of the draw, some Hammers work fine with 800 psi standard HPA, mine didn't. I only got 250 FPS max. I had to add a few shims to get my output to 950/1k before I hit 310 FPS max, then I was able to turn the velocity down to my field chrono of 275 and still have adjustment range in either direction so I can adjust to different paint.

I recommend grabbing a co2 tank with the Hammer just in case. It's cheap and ensures full functionality. Size is up to you, but with it being a pump gun I would do the 9-12oz you were thinking already
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Old 07-04-2014, 08:01 PM   #5 (permalink)
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I'll probably do that. I'll probably also run it as a regular pump to begin with and move to magfed later on
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Old 07-09-2014, 01:20 PM   #6 (permalink)
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I play pretty aggressively, how many mags would you recommend I buy with it?
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Old 07-09-2014, 03:48 PM   #7 (permalink)
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Originally Posted by jerryjjackson69 View Post
It depends on luck of the draw, some Hammers work fine with 800 psi standard HPA, mine didn't. I only got 250 FPS max. I had to add a few shims to get my output to 950/1k before I hit 310 FPS max, then I was able to turn the velocity down to my field chrono of 275 and still have adjustment range in either direction so I can adjust to different paint.
Did you try going to a weaker valve spring?
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Old 07-09-2014, 05:59 PM   #8 (permalink)
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Did you try going to a weaker valve spring?
I tried, but didn't have anything that worked just right. You could probably trim the stock spring but without a replacement handy it could be risky.

My issue with the weaker valve spring was venting when cocking, which caused double feeds, barrel breaks, and inconsistent velocity. But since then I have adjusted the pump arm length to prevent such nonsense, so it might be work revisiting.
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Old 07-11-2014, 03:11 PM   #9 (permalink)
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I only have one mag when I go to play in the woods. It's mainly because of the $35 they want for a 9 round mag. I am playing around with making my own since I live at work now.

Reloading mags manually is harder than stock class!
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Old 07-11-2014, 03:15 PM   #10 (permalink)
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I only have one mag when I go to play in the woods. It's mainly because of the $35 they want for a 9 round mag. I am playing around with making my own since I live at work now.

Reloading mags manually is harder than stock class!

Locally they're $20 plus my discount for working at the local field. So I should be able to bring it down to about $17-$18 a mag.
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