Would some please explain what this gun is

[Mont]

I found this for sale on Airgun's of AZ web site, Has any body done this to there gun or shoot one?  Is this a kit? Thanks Joe
Custom Benjamin 392

Air Conserving Pumper (ACP) MkII

Benjamin ACP

Developed by Steve Woodward, the Benjamin ACP takes pump-up rifles to the next level. Utilizing state-of-the-art technology in air conservation, the Benjamin ACP uses less effort to achieve full power shots, and is significantly quieter than the standard model. By installing a hammer debounce device, the otherwise wasteful valve now conserves most of the stored air for use in the following shot. By simply pumping the rifle initially to the full 8 pumps and firing at full power, the next sequential shots only require 3 pumps* to achieve the same full power. This drastically reduces the amount of time and effort between shots, making follow up even quicker. Plus, the conservation of air greatly reduces the muzzle blast that a standard Benjamin would have. In order make the rifle less complicated to use, the ACP comes with a simple pressure sensor module which protrudes when the rifle is fully charged with air. This eliminates the risk of overcharging the rifle and locking the valve. When the pressure sensor protrudes from beneath the stock, the rifle is fully charged. Added to the innovative valve design is the reknowned SuperSear trigger, installed. This sear changes the factory trigger configuration and produces a true 2-stage trigger.

The latest MkII version comes with new features which make this rifle even better! The pressure sensor module has been modified to include a travel limiter, which eliminates the risk of the sensor causing pain while pumping. The trigger sear is replaced with a Dual-Power SuperSear, which restores the key feature of a pumper, the multiple power settings. And, while multiple power settings are handy on a standard pump rifle, the Benjamin 392 ACP MkII enters a new category as a self-sustained precharged rifle. On lower power from a fully pumped ( charge, the ACP MkII gives 3 consistent shots at 500 fps with 14.3 grain pellets before it needs just 5 pumps to recharge!

Model       392ACP
Mechanism       Bolt-action
Power Source       Pump
Caliber       .22
Capacity       Single Shot
Velocity       up to 685 fps
Weight       5.5 lbs
Length       overall: 36.25"
Barrel       Black Brass, 19.38"
Rifling       Right Hand, 6 grooves, 1 turn in 14"
Stock/Forearm       American Hardwood
Front Sight       High Ramp Blade
Rear Sight       Open adjustable
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Guide

ACP Pump Guide

 

[moorepower]

They turned a high powered pumper into a medium power PCP, kind of.

[longhunter]

wouldn't waste my money.

[Matt15]

wouldn't waste my money.

X2!

[bbv13]

Most folks consider a pumper holding a lot of air a problem. I assume he is adding a spacer or using a stiffer valve spring to limit the amount of air it releases? Possibly modifying the exhaust valve or a lighter hammer or hammer spring? It could be a combination but either way with a little experimentation it's not that hard to modify a pumper to work in a similar way. I wouldn't waste my money on it either but the idea is interesting. I don't think Crosman will build a gun like this but a pumper that would shoot three shots at 650-700fps on a full charge would be cool. I would rather have a pressure gauge than a sensor. That way you pump until you hit the pressure required and shoot.

Bryan

[Charles Outdoors]

  Most missed the point of this rifle.  Once pumped up it only takes 3 pumps each shot instead of 8 from a normal 392 to get your full power shots.  You can have a couple shots in reserve without pumping if needed. The indicator would beat a gauge cause all you need to know is when it's full and you can feel it without looking. It also has a modified trigger.

 It's a cool ideal and should work fine.  Basically just made it a lot more efficient.  Still on the fence over the price.   

[bbv13]

  Most missed the point of this rifle.  Once pumped up it only takes 3 pumps each shot instead of 8 from a normal 392 to get your full power shots.  You can have a couple shots in reserve without pumping if needed. The indicator would beat a gauge cause all you need to know is when it's full and you can feel it without looking. It also has a modified trigger.

 It's a cool ideal and should work fine.  Basically just made it a lot more efficient.  Still on the fence over the price.

The OP wanted someone to explain this rifle and I did my best. When I recently put my basket case Benjamin 317 together it held air and after 8 pumps would release a full power shot. It took about three pumps to get another full power shot. I played with it for awhile and then cut a few coils off the valve spring to solve the problem. It now dumps 10 pumps if needed but I have it sighted in at 15 yards with three because I mostly plink with it.

Most of us understand exactly what this gun is and that it's not rocket science to modify a pumper to work in a similar way. That's why several including me have said they wouldn't waste their money on it.

Bryan

[longhunter]

  Most missed the point of this rifle.  Once pumped up it only takes 3 pumps each shot instead of 8 from a normal 392 to get your full power shots.  You can have a couple shots in reserve without pumping if needed. The indicator would beat a gauge cause all you need to know is when it's full and you can feel it without looking. It also has a modified trigger.

 It's a cool ideal and should work fine.  Basically just made it a lot more efficient.  Still on the fence over the price.

The OP wanted someone to explain this rifle and I did my best. When I recently put my basket case Benjamin 317 together it held air and after 8 pumps would release a full power shot. It took about three pumps to get another full power shot. I played with it for awhile and then cut a few coils off the valve spring to solve the problem. It now dumps 10 pumps if needed but I have it sighted in at 15 yards with three because I mostly plink with it.

Most of us understand exactly what this gun is and that it's not rocket science to modify a pumper to work in a similar way. That's why several including me have said they wouldn't waste their money on it.

Bryan

I actually had other reasons. not going to get into it in the open forum.

[moorepower]

Full power is 685 per site. It's shooting 500?? They turned a 392 into a lightly modded 1322 power wise. Novelty, yes, practical I'm tempted to "try" to tune down my Disco to 8fpe and see how many shots I get.

[Charles Outdoors]

Full power is 685 per site. It's shooting 500?? They turned a 392 into a lightly modded 1322 power wise. Novelty, yes, practical I'm tempted to "try" to tune down my Disco to 8fpe and see how many shots I get.

500 if you want 3 shots.  Or shoot a 685 FPS shot and then it only needs 3 pumps to shoot full power again.

[Charles Outdoors]

  Most missed the point of this rifle.  Once pumped up it only takes 3 pumps each shot instead of 8 from a normal 392 to get your full power shots.  You can have a couple shots in reserve without pumping if needed. The indicator would beat a gauge cause all you need to know is when it's full and you can feel it without looking. It also has a modified trigger.

 It's a cool ideal and should work fine.  Basically just made it a lot more efficient.  Still on the fence over the price.

The OP wanted someone to explain this rifle and I did my best. When I recently put my basket case Benjamin 317 together it held air and after 8 pumps would release a full power shot. It took about three pumps to get another full power shot. I played with it for awhile and then cut a few coils off the valve spring to solve the problem. It now dumps 10 pumps if needed but I have it sighted in at 15 yards with three because I mostly plink with it.

Most of us understand exactly what this gun is and that it's not rocket science to modify a pumper to work in a similar way. That's why several including me have said they wouldn't waste their money on it.

Bryan

Sure, you can tune one yourself, but your gonna needs so serious skills and tools to take it to the level these are at.  You can steroid  your own also, but you notice most choose to have it done professionally.       

[bbv13]

Well if you want to spend some money on a pumper finding a nice accurate Racine Benjamin 342, Benjamin 392 or Sheridan and sending it off to Mac1 for the Steroid treatment is a much better way to go.

There are several other reasons why I wouldn't spend my hard earned money on one of these but I'm not going any deeper into this.

Bryan

[Charles Outdoors]

  I know there are personal reasons people would not buy a gun from someone or some place, but is there a functional or workmanship issue with these modded Benjamin's that people should be aware of?

[bbv13]

It's not personal for me. I don't know the guy that does this modification from Adam and have done business with AOA and not had any problems.

Look if you want a nice pump air rifle and don't want to take the time to find a vintage gun buy one of the new Benjamin's. Odds are that you will get a good one. Crosman has had some manufacturing issues like but not limited to off center breaches and barrels. It's well documented on this site and you can look it up by reading old post. When buying any new air gun do business with a retailer that has good return policy. That way if you happen to get a bad one you can send it back and get another one without having to deal with the manufacture, modifier or retailer that sells modified guns? Who is responsible? I personally would buy one from Walmart because they will pretty much take anything back for any reason and you will probably get delivery to the store free. Once you know you have a nice accurate gun and the factory warranty has run out then decide if you want to modify it or leave it as is?

That's all I'm going to say.

Bryan

[Charles Outdoors]

I'm set on Benjamin/Sheridan pumpers as you can see. I don't shoot them much anymore, just collect the older ones if I come across good deals. 

I had seen this rifle earlier and then seen the OP was asking about it. There were various opinions on not to buy it yet I didn't really see anything solid on why other than it's $339.00. It is an interesting gun and if I was into shooting pumpers, I could see this as a nice upgrade to the new standard Benjamin. 3 easy pumps to full power is quite an improvement. A 2 stage adjustable trigger. A three shot low power option with 5 pumps to get back full.

 Wish I had this growing up, then again, Shooting my old pumpers was good exercise. I surprised a lot of people when it came to arm wrestling.    

[moorepower]

If you only have to use 3 pumps to get to "full power" it is not really full power is it. It "may" be 685 but not full power it is capable of. Whatever floats your boat. 

[Charles Outdoors]

If you only have to use 3 pumps to get to "full power" it is not really full power is it. It "may" be 685 but not full power it is capable of. Whatever floats your boat. 

Evidently if you pumped it more you could lock the valve the way it is tuned. They added the plunger thing that sticks out the bottom to let you know to stop pumping. 685 fps would be with a light weight pellet. It's @ a 13 FPE gun.   

Full power is claimed to be 13 FPE.  Once you have it pumped up which takes 8 pumps empty I guess, you shoot on Hi power to get 13 FPS, you pump three times after each shot to maintain 13 FPE.

Did more digging and found some answers.


  It's a 13 FPE gun. It takes 2 - 4 pumps in between hi power shots. There is not that much modding done to the gun so it really seems over priced. The pressure sensor sounds more like it senses much pressure it takes to close the pump arm. It's suppose to be a quite as a spring gun. It uses the stock aluminum valve which Timmy Mac said will corrode. The trigger can be adjusted but it's just a super sear mod but gives a 1 lb 10 ounce pull. The valve body is left unscrewed some to increase head space and I guess add volume for air.

The guy that made it had few friends here to put it nicely.

Overall I would not be comfortable buying one. Way over priced for how it's done. If it had a custom brass valve made and a real way to measure pressure I would have been more impressed. 

Did find the thread on what was done to make it.

http://www.network54.com/Forum/79537/message/1226636309/An+example+of+why+tinkering+with+airguns+is+so+much+fun 

[Rob112o]

Here is my 65 Dan, because of simple tense from valve and hammer spring working together or against each other. Depending on how you want to look at it. It's now a ACP rifle that I only spent a little more than 100 bucks on. Granted it came in pieces not a single thing together other than the forearm attached to the lever. She shoots great and as accurate as any Streak out there.  They can sell that 392 for however much they want, but it ain't worth nearly as much as this Streak to a real air gunner.
    That idea of having a full power shot on 3 pumps is nice. But, after that first full power shot what good is another full power shot right away? After, you've scared every living creature within 200 yards away? So what you are really getting is another full power mercy shot. You don't really need a full power shot after you botched the first attempt and just wounded the critter you where shooting.
I copied and pasted numbers from my other post, 65 Dan:
10 shots with 8 pumps
1. 656
2. 664
Realized air was left so cleared valve
3. 639
4. 637
5. 637
6. 640
7. 641
8. 640
9. 639
10. 641
Not counting the first 2 shots
Extreme spread.       Avg fps.       Avg deviation       FPE
         4                    639fps.              2.                12.97       
Now, since I realized it was holding I decided to see what she had left after a full 8 pump shot.
0 pump- 312fps
1 pump- 418fps
2 pump- 476fps
3 pump- 525fps
4 pump- 569fps. (air left after this shot, small puff)
This is from empty valve:
2 pump- 378fps
3 pump- 448fps
4 pumps- 511fps
5 pumps- 555fps (small puff left)