My Benjamin 392 Arrived ;- )

[Yng@hrt]

That’s the cam plate. It is also how you adjust the tension for the bolt. If you flip the bolt into the up position, then tighten the screws, it will snug up the bolt.

+1 & if you ever decide to remove the cam plate, to remove the screw, to remove the bolt, be careful because there is probably spring with a ball bearing that will go airborne if you don't cradle it while removing the bolt. 

[wll2506]

Well, I said they are bad mounts.

I added some tape betwixt the mounts and barrel to help with the whole thing.

As I have said, I *hate* this setup.  I'll grab a mount like the Mac1 and move my scope back and mount it more symmetrically.



Can anyone tell me about the little metal plate opposite the bolt?

I agree, these mounts are not well designed  ... Can you imaging making a design that when you tighten the rings, that action can loosen the mount on the gun ----- REALLY, REALLY !!
Yes, I will figure out a way to make it work, but very, very, very few customers would do that !!

SIDE BAR : I have three different types of double face tape that I will try tomorrow, One is a UHB general use tape, the other is a water proof flexible tape that is used to make sails, and the third is a bit thicker double face tape that is water proof yet flexible. All are very high quality products. Depending on the outcome I will give you guys the product number so if you decide to use this mount, you can make it work without slipping or separating the barrel from the compression tube.

Crosman needs to start making some quality stuff, they need to pick up there game as the airgun market is getting bigger and bigger and more and more competitive. If Crosman does not see what is happening in the airgun world, they better start ... this is not the '60's, 70's, '80's  or 90's. In today's universal world internet market, if you come out with a sub standard product, the first review that gives it a thumbs down, you are dead in the water BEFORE your product has hit the dealers shelves. The whole world knows about it in a matter of minutes ... You better do your homework for sure !!

An example would be a gun that I love but needed a Generation 2 to make it right ... The Fortitude .. a super gun that needed some more thought before it was brought to market. .. I'm personally looking forward to the release of the Gen 2 gun as I NEED the upgrades to my first generation Fortitudes.

So much for my rant .. and yes, I'm a big Crosman fan, I just want to see a bit more quality and thought go into some of there products ;-  ).


wll

[wll2506]

Put double face tape on the inside of the mounts where it lays on the compression tube and where the mount comes in contact with the barrel and put then on,  just snug enough to where the tightening screw stops as this is giving full compression to the tape ... these mounts now do not budge, if you loosen the tightening screw you would have to peel the mounts off the compression tube and barrel !!

The proximal mount is 2.250 from the receiver and the distance between the mounts is 2 inches I sighted the gun in using 4 pumps at 12 yards and she was laying them in there ;-  )  Yes, I still have to swab out the bore. The rings I'm using are pretty much cr@p too, they are B-Square #27052 low 22/airgun mounts and they are made for 3/8" dovetail only ... 11mm will not work, these are non adjustable. For my application on the Benjamin Inter-mount that is designed for 3/8" rings ... IT WORKS WELL.. Never before in my life have I put two POS's together and have something come out working !!, but I really don't think it would have worked without the double face tape. I used some left over Duraco # 46650 double face tape that is about 1" wide and 8mil thick I believe. I'm darn sure that I could have gone to one of the big hardware outlets and got some 3M picture frame hanging double face and it probably would have been better ... that stuff is awesome !!

Pic of mounts and rings below.


wll

[Psipumper]

I don’t like any mounts on the market as well. Why doesn’t anyone build something simple like these? They can be tightened without damage as there is only .002” squeeze. 1 inch scope tube .
1 1/4 center to bore center.

[wll2506]

I don’t like any mounts on the market as well. Why doesn’t anyone build something simple like these? They can be tightened without damage as there is only .002” squeeze. 1 inch scope tube .

Yes, those are beautiful, simple, clean and no problems for sure... did u make those  ? Those are perfect. If someone made something like that and sold them at a reasonable price, they would become the mount of choice for the Benji and Dan guns !

wll

[Habanero69er]

That’s actually a good idea Charles. Why doesn’t someone? We’ve got lots of machinists on the GTA.

[Yng@hrt]

I don’t like any mounts on the market as well. Why doesn’t anyone build something simple like these? They can be tightened without damage as there is only .002” squeeze. 1 inch scope tube .

I agree...that is a very nice design. You should run with it.

[35 shooter]

Yep  all I would want to know is how much for a set of those!!!

[TerryM]

  I've used the Benjamin B272 mounts on four or five guns and have never had a problem with them.  I have a couple of Mac1 mounts on two Crosman 114s.  The B272 mount is only 1/4" or less lower.  They are based on the old Sheridan intermount which I also have on some guns.  They will not pull your gun apart as long as you don't get crazy tightening them down.  Just snug, there is no heavy recoil to overcome.  I usually use cheap Weaver rings, plenty good for an air rifle.

[wll2506]

  I've used the Benjamin B272 mounts on four or five guns and have never had a problem with them.  I have a couple of Mac1 mounts on two Crosman 114s.  The B272 mount is only 1/4" or less lower.  They are based on the old Sheridan intermount which I also have on some guns.  They will not pull your gun apart as long as you don't get crazy tightening them down.  Just snug, there is no heavy recoil to overcome.  I usually use cheap Weaver rings, plenty good for an air rifle.

I just snugged them down, but with the double face tape at all the contact points, that mount is not moving, the gripping surface area has greatly improved !

wll

[wll2506]

Got my screw on tins today and they are perfect, two tins just barely fit into the butt pouch. One tin to carry pellets and one to carry a small container of oil, a cleaning pull through unit and some patches. Very Nice, they are 2.62" in diameter and about .95"+ in height. The tin with the blue paper towel cut to size holds almost 250ea pellets

Here is a a couple of pics of the tin and the tin filled with pellets



SIDE BAR: I shot my 392 a little bit today and ran her over the chrono .... JSB Heavies with 8 pumps are around 567fps, and with 5 pumps I'm very close to 500fps. I'm thinking I will stay with these JSB Heavies as I was hitting everything I was shooting at although I did not put her on paper !

This weekend I will tune her in and make my final determination on my aiming points, with 8 and with 5 or 6 pumps ?

wll

[wll2506]

Received the cleaning pull thru coated cable, a small vile that holds enough "Secret Sauce" for at lease 4 maintenance lube jobs between 250 pellet rounds and enough .22 cal cotton swabs to make sure the bore stays clean if I have to use them.. A allen key for the rings and a small blade screw driver head will also be put in

All fits in the little tin and both the ammo tin and the cleaning tin are in the butt pouch !



wll

[wll2506]

I'm so looking forward to Saturday as I put in the modified trigger, and maybe a mod valve spring to take off some of the amount of force needed to open the poppet !! I Very well may open the valve transfer port hole to ~.1695,(# 18 drill) a bit conservative but a bit more than factory, I may put another "O" ring around the TP hole to stop air leakage. !!!

The slightly larger TP size and the softer valve spring, and extra "O" ring should give me the few more fpe that I'm looking for. I'm not looking for 20fpe at the muzzle  .. 16+ would be enough to push me over 12fpe at 40 yds ..with 8 pumps.

wll

[Horatio]

If anybody knows different, please correct me.

I thought between the barrel being polygon and brass that they don’t get cleaned.

Glad you like your gun.

[wll2506]

If anybody knows different, please correct me.

I thought between the barrel being polygon and brass that they don’t get cleaned.

Glad you like your gun.

The Benjamin barrel has polygonal rifling and can't be cleaned ?

I look at my pellets after being fired and they don't look polygonal to me, pretty sharp and well defined rifling.

I used to wipe my Sheridan barrel every few thousand rounds to get any crud that might be in the barrel ? Never used a brush or anything like that, just run a patch through it to remove any grit or ? that got in the bore through a few months of field use. After that, a few shots (~5 or so) brought zero back to normal. Never removed any lead or anything as the pellet really doesn't go fast enough or get hot enough to cause that type of thing I believe.

Are you thinking maybe of another gun? ...... Unless I'm way wrong, I stand corrected ?

wll

[Horatio]

Idk. I think the brass explains the lack of lead build up.

Let me shoot into some grocery bags. Maybe I remember wrong.

[RBQChicken]

If anybody knows different, please correct me.

I thought between the barrel being polygon and brass that they don’t get cleaned.

Glad you like your gun.

The Benjamin barrel has polygonal rifling and can't be cleaned ?
wll

I was going to start a thread asking about this very thing (polygonal rifling). I just got a 1997 397PA (with "P" style trigger) and when examining the crown (with magnification) I thought it looked very much to me like polygonal rifling.  I pushed a pellet through with a wooden dowel and found very well defined rifling marks on the pellet.  I wasn't expecting that.

[wll2506]

Got home and took the trigger mechanism housing apart.

Then ground down the anti - decocking arm just enough not to clear the top of the housing and cause interference with the bolt .... it works just beautiful, I’m all smiles.

The next and hopefully final project is lighten the spring in the valve, block the air from excaping around the valve port hole and install an adjustable piston.

I’m hoping these easy for me to do modifications boost fpe to 16+ at the muzzle and give me +12fpe at 40 yds :-)

wll

[Psipumper]

The next and hopefully final project is lighten the spring in the valve, block the air from excaping around the valve port hole and install an adjustable piston.

I’m hoping these easy for me to do modifications boost fpe to 16+ at the muzzle and give me +12fpe at 40 yds :-)

wll

You should be closer to 16 fpe. I would have concerns about trying to install an o- ring around the valve port hole. A precision groove would be very difficult and the oring would make for trouble assembling the valve into tube.

[wll2506]

The next and hopefully final project is lighten the spring in the valve, block the air from excaping around the valve port hole and install an adjustable piston.

I’m hoping these easy for me to do modifications boost fpe to 16+ at the muzzle and give me +12fpe at 40 yds :-)

wll

You should be closer to 16 fpe. I would have concerns about trying to install an o- ring around the valve port hole. A precision groove would be very difficult and the oring would make for trouble assembling the valve into tube.

I 100% agree, I don’t want to make this into an engineering project for sure !!!

Looking for that doable fpe at muzzle that will give me 12 fpe ish at 40 yds !!!

wll