Author Topic: 30 mrod build (Read 6216 times))

mann · « **on:** February 02, 2019, 10:53:12 PM »

Got my simplified balanced valve to seal up .it is a mrod 25 valve body with throat punched out to .280 and exhaust port at .175 peek poppet in a in regulated mrod tube. Valve opens easily . I got a Armada breech here and a bolt for it . Along with a couple old mags and a 30 Cal barrel it isn't the right twist but if everything else works out I'll have to order the correct barrel I'll have to sleeve the bolt to . I also got pellets now so I can do a full string in my brod 25 and see if it makes 100 shots at 50 plus ftlbs with a simplified balanced valve in it also

mann · « **Reply #1 on:** February 02, 2019, 10:58:42 PM »

30 Cal 50 gr make the 25 Cal 34 gr mk 2 look small

mann · « **Reply #2 on:** February 02, 2019, 11:03:17 PM »

Sorry about the bad pics

mann · « **Reply #3 on:** February 03, 2019, 12:06:11 AM »

Got the barrel sleeved for the breech since I had it turned down to 3/8 for my talon it's a 18 inch long barrel

msurf · « **Reply #4 on:** February 03, 2019, 01:23:32 PM »

Awesome Mark, I am doing the same. Just in parts ordering phase though. How do you plan to modify the mags?

mann · « **Reply #5 on:** February 03, 2019, 04:09:13 PM »

Well the valve leaked out over night and I want to make a new poppet for it but I'm out of peek so I put in a Cobra valve which I know won't get the power I want but keeps the build moving till I get more peek. As for the mag I took it apart and sanded carefully with a dremmel tool to get 5 out of 8 in the mag had to sand around the outer edge also I'm still getting the fit to be just right that's why only 4 pellets in the pic

mann · « **Reply #6 on:** February 03, 2019, 04:09:43 PM »

It's rough but I'm hoping it will work

msurf · « **Reply #7 on:** February 03, 2019, 05:04:00 PM »

Ok...seems no one is making them any more...will have to try something along those lines too.

KnifeMaker · « **Reply #8 on:** February 03, 2019, 06:18:57 PM »

Does JSAR not have any? They have them listed with the custom builds in the Marauder at 65. USD

Mag's alone were listed a week ago. I don't see them now.

mann · « **Reply #9 on:** February 03, 2019, 06:22:47 PM »

I didn't try jsar I found used 25 Cal mags for sale at hill air gun for under 10 bucks I figured I could give one a try

mann · « **Reply #10 on:** February 03, 2019, 06:42:56 PM »

I just finished testing my brod 25 filled to 4500 psi reg set at about 2100 I averaged 50.04 ftlbs for a 100 shots fell off the regulator for the last 5 shots so 799 was low and 827 was my high got a average of 814 with ace care .5L bottle I'm happy with that

mann · « **Reply #11 on:** February 03, 2019, 07:54:32 PM »

If I can't get the mag to work I'll get a single shot tray or try to make one out of the mag .I might finish the upper and put it on the brod lower half just to see it can do

mackeral5 · « **Reply #12 on:** February 03, 2019, 10:01:58 PM »

Looking forward to seeing your results. I happen to have a single .30 mag that I want to build a caliber change kit (barrel/bolt sleeve) for my QB78 w/acecare 500cc bottle. it's currently a .25 with a 18.5" barrel. With LDC it's a little over 40". Currently it's tuned to 58fpe with not too bad of efficiency.

I'll be anxious to see what kind of numbers you get with your .25 powerplant and a .30 upper with a relatively short barrel.

mann · « **Reply #13 on:** February 03, 2019, 11:13:33 PM »

I'm curious about it also with 30 Cal barrel being short . The valve in it is ss valve body with simplified balanced valve poppet and thimble 31 gram hammer a ssg with 13 lb flat spring . If I changed the hammer and open the tp adjuster the valve would have enough to put up some good numbers it's a .290 throat and .200 exhaust port with a set screw to choke it down to enable me to get some more adjustment out of the valve I'll put in a .200 tp in the 30 Cal and probably a .200 barrel port think about building a shroud yet also for that upper more I think about it I may just use it as a upper instead of putting it on the other tube I have

mann · « **Reply #14 on:** February 06, 2019, 06:57:10 PM »

Well I got the mag to work today at least cycle threw 5 pellets I'll have to do some more testing with it . I'm going to make a ssg with it's own end cap so when I switch uppers I'll switch out ssg to its own and its own hammer that way I won't have to retune each time I switch from 25 to 30 Cal

cpt_sfc · « **Reply #15 on:** February 06, 2019, 07:32:11 PM »

I did a 30 cal m-rod 2 years maybe less ago. Used a green mt barrel , a hill valve and breach seal, 12 lb spring and I sleaved it twice with carbon fiber. It is a very loud tack driver , get 2 mags out of it then refill to 3000 psi Top fps 983 low 907 for the 2 mags . Next shot gos to 827 and lower drops off like a rock but ok for hunting . 50 gr Exact pellet. Ported it as large as the hill seal would take , can't recall but I was worried as I polished the hole with cratek dremal. so it is big. But loud , I live in the woods so oh well. Some CO would give me heck if I put a mod on it. They still think you can't hunt with an air rifle. I carry a copy of the law in my pocket. PS got my mags from WAR for his early 30 cal rifle.Have fun

Prouzy · « **Reply #16 on:** February 06, 2019, 07:33:44 PM »

I dont know if there are any other internal parts needed to be modified in the mag, but check out this thread: https://www.gatewaytoairguns.org/GTA/index.php?topic=143205.40

There are some folks in it probably can make a design for 3D printing, in fact last post Aluminumfetish offers assistance in design.

mann · « **Reply #17 on:** February 06, 2019, 08:22:17 PM »

The star inside needed to be opened and I sanded around the inside of the mag housing because I took the inside star piece down about as far as I could and still needed a little more room also had to drill out the holes to 30 Cal

mann · « **Reply #18 on:** February 07, 2019, 06:31:15 PM »

Well I ordered a lw barrel that's choked and a better twist rate for pellets

dyotat100 · « **Reply #19 on:** February 08, 2019, 07:05:23 PM »

The 30 LW is no good. Better to get the 30 pellet from TJs. I have one in a condor and it does real well. Made the finals at EBR twice with it.

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30 mrod build

Author Topic: 30 mrod build (Read 6216 times))