Detuned Nitro Piston Diary - the Mild Mannered Spring Rifle

Entry 1.

A couple of Tom Gaylord's articles/blogs from the past hit home with me in recent weeks. In particular, Tom's series on the Benjamin Legacy rifle ("Interesting Gun Designs - Benjamin Legacy") and his comments about the Air Venturi Bronco got stuck in my head. In both cases Tom made the argument for lower power, lower velocity, and easier cocking of break barrel rifles to improve the overall shooting experience for air gunners for whom hunting is NOT the primary purpose of shooting. I was intrigued by his discussion of these hard-to-find (well nigh impossible for the Legacy) rifles and wondered if there are any latter day examples of such mild-mannered shooters.
My search took me to many "youth rifles" and "junior rifles" among the major US manufacturers, as well as the celebrated lower powered spring rifles from Germany and Britain. The German and British guns remain out of my reach, not because I can't save up the cash over the course of a year but because I remain convinced that there are quality spring rifles at lower prices which will meet and/or exceed my shooting capabilities. I did end up buying a (British? Spanish?) rifle: the Gamo Recon G2 Whisper, a .177 featherweight with a short LOP for juniors and a decent trigger for plinking. Great 10-15 meter gun, extremely backyard friendly, pretty good accuracy, low power, and good open sights using the thinner fiber optic rods that Gamo has rightly been praised for employing.
Yeah, that Recon G2 Whisper is a real treasure... for my 13-year old granddaughter. Don't get me wrong, it's a very fun gun to shoot! All you hear with your cheek literally in contact with the stock is a somewhat hollow 'TUNGGG' with each shot; downrange beyond 5 yards or so you lose the sound in the background noise while outside. I even had a fellow shooter at the range take some shots from that Gamo and come away with nothing but smiles and a new interest in air guns. But it is definitely a youth rifle. Too short, too light, and too "tactical" for an older duffer like me.
Happily, around the same time I pulled the trigger on buying the Gamo, I stumbled across an interesting Walmart online add: the Walmart exclusive Crosman F4 Classic Nitro Piston in either the standard variety (1200 FPS! 70% QUIETER! 25% MORE ACCURATE!!) with a Monte Carlo stock, or the much more interesting detuned NP version shooting at a claimed 695 fps (PBA ammo). Knowing modern Crosman break barrels as I now do, I figured that the true velocity of 8-9 grain lead pellets would be somewhere in the mid-500s and that the trigger would be saddled with the usual "lawyer spring" and would require some work. That said, I was intrigued. I very much liked the look of the black synthetic Monte Carlo stock, I already had a 5x8x2mm RC bearing on hand for the trigger fix, and the detuned Nitro Piston's performance seemed like it was right where I wanted to be.
While much heavier than the Gamo G2, the F4 is not as heavy as my .22 Benji Summit but still affords me a full-sized stock as I prefer. The breech block is well made and locks up tight, there is no significant droop, the stock is solid so no hollow reverb to be found, and the firing cycle is smooth. Oh yeah, the trigger was a typical Crosman; if there'd been any more creepiness to it the gun would only ever be sold on Halloween! I required myself to shoot if for the first week without any trigger mods in order to assess the gun while still able to return it if need be. It did shoot fairly well on the range - enough so that it too was shot by a fellow club member with pleasing results.
The F4 passed it's trial phase with relatively good scores so I made the trigger mod this evening. A quick twenty pellets were shot indoors at 10 yards using a shredded rubber pellet trap and YEE-HAW WE HAVE A SHOOTER! Standing unsupported using Crosman 7.9 gr CPHPs, the F4 was putting the pellet right on my POA. Any crappy fliers, sad shots just off the paper, and other signs of non @Hajimoto accuracy in the shooting are entirely my own fault.
And the best part is the ease of cocking that gun! Gaylord was right, for straight-up plinking pleasure and endurance while shooting informal targets this mild-mannered NP is a treat. Better still, the detuning appears to be a true change to the gas piston pressure load and not some half-baked hole drilled into the piston cap to allow air to escape during the shot cycle. I'd be doubly pleased to learn that the seals on the detuned piston are the same as those used on the standard piston, as this would indicate that the detuned piston's life expectancy is even longer than normal due to a lower stress load over time. That's all conjecture but a man can dream.
Now that the trigger is more to my liking I'll get some pics of both the gun and the groups. @Windmill01 is on me about posting photos of my new backyard layout for shooting and I'm way overdue to oblige him.
 
Iornlion269 as usual a great story, amusing, informative and accurate. I have been singing the praises about lower powered gas rams in this forum for a while now, but most like the extra kick or power that a magnum gas ram gives.

Over a year ago I was having issues with my 22 cal Trail so I replaced the gas ram. Fortunately for me at the time the company whom I purchase air rifle parts from didn't have a 55-60 kilo gas ram, the ones rated and used in the Benjamin Trails, but they had Gamo gas rams aplenty. The Gamo gas ram is rated 50 kilos so in it went. This reduced the fps down to 710 fps which is nothing to be sneezed at in 22 cal. Well what happened, the cocking effort to me felt like is was reduced by half and it was now and still is very accurate and quieter, also the shot cycle was smoother. Happy days.

Enjoy shooting that air rifle my friend and ....."............,....... where are the pic's
 
Entry 2

Had a few minutes (10) to commit to shooting before meeting with some men from Church so I pulled out the F4 Classic and popped off a few Target Exact wadcutters at 10 yards in the garage. Trigger was much, much better but still not quite there.
After the men's group dispersed I had about an hour available to shoot some more. This time I put up new targets on the pellet trap and set up at 10 meters (measured by tape) and sat in a folding chair with arm rests to provide some support to my shots. Stuck with the Target Exacts even though my testing shows that the Hatsan Vortex Supreme pellets are the go-to pellet for this gun. By the time my hour was up I'd managed to put up these 10 shots into one of the target bulls...
2611e9591ac810b4d738e587ed8719fd.jpg
cbe46898f2f088395cb77d9e77b3156d.jpg
Fliers are me still learning the trigger and hold for this gun.

So here are my synthetic siblings, courtesy of Crosman/Benjamin...
4b71a092d73a1425190dfbaaf4cce486.jpg

.177 F4 in the front, .22 Summit in the rear. Both destined for a tear-down and home tune, my first effort at doing so. With the reduced power and velocity, the F4 is almost as quiet as the Summit. Two backyard friendly air rifles. I am blessed.
 
Iornlion269 I notice the F4 has the same hard plastic barrel grip my Trails have. I was under the impression false obviously 🙄 that most air rifles sold in The USA had suppressors fitted like your Summit. Also do you require a permit to purchase an air rifle where you live. I'd be broke if I could just walk into a gun shop and buy an air rifle or two, I'd have a shed full of safes. We have to obtain a permit to aquire from the Weapons Licencing Branch of the state police, it has to nominate what you are buying and from where. If we didn't have to do this I think I would be an impulse buyer.
 
No license required for air rifles where I live in Central Indiana. That may change rapidly with the deterioration of the protection of gun owners' rights, due mostly to ginned up fear on the part of hard-Left interests. Still, as of today I can buy virtually any air gun sold to the public by either walking into a store where there is stock available or by ordering online from manufacturers or distributors or even private individuals posting on eBay et al. Controlling the buying impulse is indeed a daily discipline. The struggle is real. :)

As for the moderators and shrouds, that is an evolving trend. When I was a kid, between dodging velociraptors on the walk to school and gathering wood for the cooking fire and red clay for the cave drawings, shooting non-silenced air guns was no issue. In many rural areas kids would go out with their rim-fire guns and plink around in the woods or fields without issue. Now the need for low visibility and sound discipline is much more pronounced. Moderated/silenced air guns started out on the higher end and the expense of those enhancements is slowly working its way down the cost ladder to the level where I lurk. The Summit benefits from the very effective (and totally bad-ass look, IMHO) of the Crosman full barrel shroud, coming as it does from a little ways up the Benjamin line of hunting/sporting guns. As for the F4, I specifically chose the detuned model confident that along with lower velocity and power would come less noise. I have not been disappointed in that.

Lots of the "low end magnum springers" still produce quite a bit of noise, though. Guns that are advertised as shooting 1200 to 1600 FPS without sound suppression are still common as dirt here. I still see video posts from guys (typically) who insist on having that supersonic "CRACK" coming from an air gun. I believe change is in the air here in the US, though, and Heaven only knows how far the backlash on owning guns will go - no matter the kind of gun. Remember, school districts all over the Country suddenly became unhinged regarding 'gun free zones' after the mass shooting in Newtown, CT*- to the point that a piece of bread or a pastry chewed into the shape of a gun became grounds for suspending a child. Madness. The kind of madness that will work itself out in the form further legal and social pressure on gun owners of every stripe, air guns included.

* had to correct the reference to the Sandy Hook school shooting
 
Red clay? I'd imagined that you were of the wild berry era for painting the walls. I hear what you are saying about gun ownership and you a probably correct in thinking the laws will change sooner then later. I looked up gun laws in the various states of your country and was surprised on the variances, some of them huge that exist.

Thanks for the feedback to my questions, and while I'm thinking everything air rifle have you tried 10.66 grain pellets in your back yard shooter yet. I don't think the performance will drop substantially in your F4 but it will be even more quieter. Give it a go if you haven't done so already.
 
Entry 3

Saturday morning early I tried home tuning my F4 for the first time. Chose to tune by breaking it down, cleaning the air chamber, piston, gas ram, and trigger assembly. Used Moly grease on the piston (yes, and the piston seals' edges :O), used a Dremel knock-off to polish each of the sears in the trigger assembly where contact with another sear occurs, then moly'd those places too. Been shooting it since, approximately 250 pellets through it so far. Shot cycle is smoother, sound is still very backyard friendly, and trigger is acceptable. A hint of creep on the take up - still working with the adjustment screw to optimize the trigger for my style.
I have 10 meter lanes set up both inside and outside so I can shoot regardless of weather. Tonight was an inside night and I decided to push myself on accuracy. Very glad I did!
Here is my shooting spot, between the door into the garage and the inner utility room door. Sitting on the 5 gallon bucket and propping my left foot up on the clear plastic container to raise my knee to optimal height.
0d579c7dcacbff853d2fb969695c302e.jpg

My shooting lane. Ignore the mess - still sorting out stuff from the downsizing move made in August.
569e5be48867a3d524188e20d29c5574.jpg

That grey box against the overhead door is filled with twenty pounds of shredded rubber mulch and then wrapped in duct tape. It is a great pellet trap and I can paste targets to it in any fashion. I also stick bottle caps to it using duct seal putty, or place targets in front of it. For my shot of the night I used the latter strategy and placed a wire nut in front of it atop a small column of putty.
23b9ca885c438aa30baf4141a8bfabbb.jpg

The photo above is immediately after my one shot from my 'bucket seat' at 10 meters. The nut is 7 mm in diameter, the .177 Vortex Extreme 8.18 gr pellet is 4.5 mm.
916c9a0d69082eb0d9ba2820fa3de3c4.jpg

It's not sub-MOA shooting at 100 yards but I figure we all need to start somewhere and I'd like to see success and growth in my shooting as I work my way outward. And honestly, having 'tuned' a $70 break barrel as a first-timer and then getting this kind of result has me pretty jazzed.