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All Springer/NP/PCP Air Gun Discussion General > Show Off Your Air Guns With Mods (SHOW and TELL)

converted my 760 to rifled barrel....heres how!

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one_shot:
most of us would like to have a 600 fps pumper in pellet only right!
every pumper i came across had a bb/pellet combo barrel,i wanted a pellet only pumper.
im gonna try to make accuracy out of this cheap,reliable pumper.
im looking for atleast 1/2 groups at 10 yards when im done.
i bought this 760 thinking it had a rifled barrel....maybe i should read before i buy huh!
when i was a kid i had a 760,the nice one's....i swear it had a rifled barrel,great accuracy.
pinched many fingers pumping that thing!

i have about $50 total invested in this project sofar.
i plan spending $15-$20 more on building a functional barrel shroud.
work is crud at the moment,just wanted to see it shoot before i go puttin hours of machine time.
she works well,shot a 1 inch 5 shot group at 10 yards,no sights.
i guess now i gotta find a pellet this barrel likes now.

the barrel came from umarex,from the hammerli x2 dual caliber/mendoza rm2006 dual caliber.
i have both barrels,ive installed the .177 for now,ill buy another 760 for the .22 barrel.
i picked up the barrel set 2 years ago at my local academy,they had a new x2 that the stock and action was crushed,but both barrels were mint....i bought it for $25.
contact umarex for actual price.

i had to shave 0.005 ths from the barrel to fit the stock plastic breach of the 760.
made a few spacers to secure the barrel.
all ugly rough work at the moment.....here she is!

one_shot:
the hammerli barrel needs some attention,ive scoped the 760,tried several rounds,best i printed was 1 inch at 10 yards with cphps.
on the hammerli x2 a few years ago,i could only print 1.25 at 10 yards,occasionaly id drop a 3/4 inch.
i deemed the gun inaccurate....and parted ways with it due to the trigger group failing.
i suspect the crown is to blame....this barrel has no crown,but a 1 inch tube added past the rifleing....im going cut the tube off and crown this barrel.



edit
after dissasembly,i checked the probe,its too short.
half the pellet skirt covers the air hole.
so i made a longer probe.
same thing happens to a 1377 if you shoot pellets with a deep dish skirt,when fired the air blows out or bends the skirt.
hopefully that solves alot of problems.
and i cut 2 inches off the barrel,its now crowned.
extended the probe,now getting 3/4 inch groups.

one_shot:
tomorrow ill get some pics of my group results.
i got my 1/2 inch 5 shot group i was looking for,took quite a few groups though.
most groups averaged 3/4 and 1 inch.
heres what i think is going on.

the gun itself is flexing,while your pumping,taking aim....ect....its plastic that flexes easily.
take your 760 and grab the body with 2 hands,lightly twist your hands in opposite directions,you can see the gun twist.
i tried 2 scopes,still not printing below 1/2 inch.

i think 3/4-1 inch is more than acceptable for this gun.
maybe with open sights i can get tighter groups,eitherway...im happy with my rifled barrel mod.
im just used to 1 hole groups,my springers print 1 hole all day long.
ive come to relize that 1 hole groups from this gun.....is just a dream.
making a longer probe did make a difference,im wondering if extending the probe on my m417 will be next!
once extended...bb's are no longer an option.

oldpink:
What a cool project.
I've always been curious about how well the grand old 760 would do with a proper rifled tube.
Hoping you can do even better with some tweaking and possibly a really good crowning.
A decent scope probably wouldn't hurt, too.

Toolmaker:
 Neat project. Keep us updated. Thanks for sharing!

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