No more GM barrels in Mrods?

[triggertreat]

It seems like the .25 cal GM barrels have 10 grooves, and the .25 cal Crossman barrels have 6 grooves.  Pretty easy to count the grooves.

Steve

Steve,   which one do you consider to be a better barrel?  My uneducated guess would be the 10 grooves, which would control the projectiles better.  I really have no clue is why I am asking this question.  Six groves could also have an advantage in some ways?


I don't want to just assume that the Crosman barrel is somehow a worse barrel than the GM.  They either made the switch for a good reason or just to increase their margins only.  I really don't know why they switched.

[Sky777]

New here.. what is GM  

[PCPhack]

It seems like the .25 cal GM barrels have 10 grooves, and the .25 cal Crossman barrels have 6 grooves.  Pretty easy to count the grooves.

Steve

Steve,   which one do you consider to be a better barrel?  My uneducated guess would be the 10 grooves, which would control the projectiles better.  I really have no clue is why I am asking this question.  Six groves could also have an advantage in some ways?


I don't want to just assume that the Crosman barrel is somehow a worse barrel than the GM.  They either made the switch for a good reason or just to increase their margins only.  I really don't know why they switched.

I would bet money that the change was about margins.

[screwwork]

New here.. what is GM  

Green Mountain Barrel

[Machinist]

Hey Keith

I don't know squat about barrels.  But I can measure them pretty accurately.  I haven't shot the crosman 25 cal barrel that I bought, so can't say its good or bad.  I know Uncle Bob is sure you need a faster twist rate for bullets.

I think all of us here are just trying to get info.  At the moment, I'm wondering if all of the new 6 groove Crossman 25 barrels are approximately the same dimension wise.

Fuzzy has GM and crosman 25 barrels, so maybe he can give us some answers.  I made him some cheap, but fairly accurate plastic gages to measure the bore, but the starter in my car died today, so I never made it to the post office.

I remember reading a story about the army buying like 1,000 rifles.  They tested every one for accuracy, and a handful were really exceptional.  Those went to the guys who could really shoot.  They also got some duds.  I think the story was like 50 years old.

If you or anyone here would like a set of 6 gages, I can send you a freebie.  If enough guys measure the old and new barrels, we can determine the high and low limits on bore and choke. 

I meant to clarify a few days ago, that the offer to Fuzzy, was actually an offer to everyone. Don't know if I stated that clearly.

Steve

[Sky777]

Cool. Thanks.. i just discovered hillairgun..  anyone know which state he is in??  Is it cheaper to buy complete rifle from him or send my rifle for him to mod.. ?

Example, i am interested in benjamin marauder .25 with GM barrel.

[triggertreat]

Hey Keith

I don't know squat about barrels.  But I can measure them pretty accurately.  I haven't shot the crosman 25 cal barrel that I bought, so can't say its good or bad.  I know Uncle Bob is sure you need a faster twist rate for bullets.

I think all of us here are just trying to get info.  At the moment, I'm wondering if all of the new 6 groove Crossman 25 barrels are approximately the same dimension wise.

Fuzzy has GM and crosman 25 barrels, so maybe he can give us some answers.  I made him some cheap, but fairly accurate plastic gages to measure the bore, but the starter in my car died today, so I never made it to the post office.

I remember reading a story about the army buying like 1,000 rifles.  They tested every one for accuracy, and a handful were really exceptional.  Those went to the guys who could really shoot.  They also got some duds.  I think the story was like 50 years old.

If you or anyone here would like a set of 6 gages, I can send you a freebie.  If enough guys measure the old and new barrels, we can determine the high and low limits on bore and choke. 

I meant to clarify a few days ago, that the offer to Fuzzy, was actually an offer to everyone. Don't know if I stated that clearly.

Steve

Thanks Steve!  If you want to send me those rods, I'll measure my two.  I have two GMs.  One is in use and the other is new.  It would be good to know more of what I have.  I can't seem to get my measurements to agree consistently.  Just pm me for my address if you do.

[Machinist]

Have been following this thread guys...thanks for the research.  I just checked mine and I do, in fact have a 10 groove barrel.  My Marauder was purchased in 2015.

Hey Mike,

Thanks for confirming that a 25 Mrod barrel produced in  2015 has 10 grooves.  I can say positively that the Mrod barrel I bought in August of 2018 has 6 grooves and six lands.

It would be nice to see groups at 50 and 100 yards from the respective barrels.

Steve

[Rick67]

Cool. Thanks.. i just discovered hillairgun..  anyone know which state he is in??  Is it cheaper to buy complete rifle from him or send my rifle for him to mod.. ?

Example, i am interested in benjamin marauder .25 with GM barrel.

https://www.ebay.com/itm/hill-airgun-5716-moderator-for-Benjamin-Crosman-and-other-air-guns-/272828288721

[Machinist]

Sure thing Keith. I turn a .245", .246", .247", .248", .249" and a .250"  The overall length is about 1.500" and I turn a length .650" long.  I make them from .312" stock.

The ones I made for Fuzzy were within a tenth or two.  Do you want aluminum or plastic?   

Steve

[msurf]

Steve, this is one of my most accurate guns off of the Caldwell field pod..only have about 27 yards to test, but my gf shoots dime groups.  It is her favorite gun! 
I think I have some pics of the targets, will look when I get back from the airport..IF I get back.  We had a major fire(s) in Maui the last few days, gf had to evacuate, I got stuck on other side of Island, and some 500 people at airport night before last.  should be ok as the fires are 70-90% contained https://mauinow.com/

[triggertreat]

Sure thing Keith. I turn a .245", .246", .247", .248", .249" and a .250"  The overall length is about 1.500" and I turn a length .650" long.  I make them from .312" stock.

The ones I made for Fuzzy were within a tenth or two.  Do you want aluminum or plastic?   

Steve

IDK, whatever is best at measuring.  Aluminum sounds more accurate when just guessing.  Whatever is best on you.  I'll send you my address.

[Sky777]

Which PCP air rifle you guys think the best out of the box for $350-$500 range?  Reliable, accuracy, powerful, and quietness.

[Machinist]

Steve, this is one of my most accurate guns off of the Caldwell field pod..only have about 27 yards to test, but my gf shoots dime groups.  It is her favorite gun! 
I think I have some pics of the targets, will look when I get back from the airport..IF I get back.  We had a major fire(s) in Maui the last few days, gf had to evacuate, I got stuck on other side of Island, and some 500 people at airport night before last.  should be ok as the fires are 70-90% contained https://mauinow.com/

That's awful.  You really gotta be glad you're alive.

[Machinist]

IDK, whatever is best at measuring.  Aluminum sounds more accurate when just guessing.  Whatever is best on you.  I'll send you my address.
[/quote]


Aluminum it is!!!
Steve

[msurf]

Which PCP air rifle you guys think the best out of the box for $350-$500 range?  Reliable, accuracy, powerful, and quietness.

Other than the guns I have in my sig, I have no experience with any others e.g Kral Arms, Hatsan (one exception), Air Arms, etc.  I can compare the .25 Marauder and the Hatsan Flashpup though....Marauder hands down. Especially with the GM barrel.  With a spring change and heavy pellet, I was hitting about 54 FPE, quiet and accurate.  Most powerful, (without getting into the big bores) easily modified, at that price range.
I actually like all of the guns I have, some are more reliable than others, some more accurate than others, some just more aesthetically pleasing than others.  For me, that is one of the many attractions of airgunning!

[msurf]

Steve, this is one of my most accurate guns off of the Caldwell field pod..only have about 27 yards to test, but my gf shoots dime groups.  It is her favorite gun! 
I think I have some pics of the targets, will look when I get back from the airport..IF I get back.  We had a major fire(s) in Maui the last few days, gf had to evacuate, I got stuck on other side of Island, and some 500 people at airport night before last.  should be ok as the fires are 70-90% contained https://mauinow.com/

That's awful.  You really gotta be glad you're alive.

Thanks Steve, fortunately no lives or major structures were affected.  We weren't in any danger perse', but I was close to some fires driving. The Emergency management community did a great job at containing these fires.

[Machinist]

My car starts!!!

A wire came off the solenoid.  Easy fix, zero $

In February a tie rod end pulled out of the center link, or whatever they call it now with rack and pinion.  Good thing I was only going 30mph.  That could have been BAD.  Apparently when they did an alignment, they didn't tighten the lock nut.  Eventually the threads wore away.

Steve

[triggertreat]

My car starts!!!

A wire came off the solenoid.  Easy fix, zero $

Steve

That's great!  Love those easy fixes.

[PCPhack]

I just received the shipping notice from Mr. Hill. That guy really ships fast. I have ordered some parts from him on several occasions, and he is always quick.