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Mayvik Saturday, April 7th, 2007
Period of
Product Use:
Less than a month2 of 2 people found this review helpful.

More than 5 years
Products Used:
T-stock, tank, tank w/buttplate
Marker Setup: Main1 -Spyder TL; Boo-Yeah ELCD frame; Evil bolt, On/Off, Detonator, Pipe kit; 45ci/4500 N2 tank; Cyclone vertical ASA/xchamber; DH Ti hammer; Shocktech spring kit/shim kit; Q-loader; Gunhead O-stock
Main2 - Phantom SC; 45 grip; 18" barrel; T-stock
Backup 1 - Tiberius 8; RHS leg drop; LHS leg drop mag pouch
Backup 2 - Crosman 3357 (x2), vertical shoulder holster, 2 spare cylinders
Backup 3 - Sidekick Semi, short barrel, modified load, tweaked valve
Backup 4 - Pending

No, I don't carry all of that at once.
Strengths: Adjustable
Realistic Look
Minimally Intrusive to Marker components
Weaknesses: Manufactuer is e-business only
Adapter may require significant rework to fit
Review: I have owned this product for 2 days now. In that two days, I have managed to open the package, install it, destroy it, and do my best to rebuild it. This review comes in two flavors; the stock, and the adapter. A note at the beginning, I've read that Gunhead has awful customer service, and while I don't want to be impatient, it is annoying not having a phone number to call. I have sent an email, and am waiting to see if I get a response..

My woes:
So I crack open my box..and run to grab my marker. I slide in the adapter fitting, which I notice is a bit snug, but I manage to push it in with thumb pressure only. I test fit the stock and am quite pleased with the look and fit. I attempt to insert my quick strip pin, and alas, it doesn't fit because the slot in the adapter is not quite cut enough. No problem, I figure I'll just sand it down a bit. Except I am now unable to remove the adapter. Apparently some combination between my Spyder's internal tolerances, the machining tolerances of the adapter, or the presense of o-rings (which I don't the stock part doesn't have them) rendered the fit waaaay too tight. One day, some pretty major damage to the adapater (velocity channel cracked and crushed, deep gouging/galling on both adapter plugs) and minor damage to my marker (a couple of anno chips and some minor scratching in the rear lower tube), and the adapter is finally removed with the assitance of a bench vise, the largest pair of vise grip pliers I have ever seen, and a rubber mallet. Despite the damage, I have been able to repair the part enough so that it will perform it's intended function, with only minor cosmetic damage which is covered by the marker and stock tube..but it was iffy for a while, especially due to the damage to the thin adjuster tube.

The stock:
The stock is wonderful. It's a nice, very light (ABS stock form over a metal tube), realstic M4 style carbine stock which shouldn't materially affect the balance of your marker. It's offset slightly low so you should have plenty of mask clearance to still get a good sight picture. It also won't interfere with your beavertail if your marker has one. Rear sling stud is greatly appreciated (although a clip would be a nice cheap enhancement for those who already have a 2-3 point sling with a clip attach). Three position adjustment should be sufficient for most people, collapse it all the way for tight situations such as urban games/indoor (probably don't want to use a stock for speedball..), and extend it when you have some room.

The adapter:
This product NEEDS to come with a warning that some assembly will likely be required. And by assembly, I mean minor machining.

How to install the O-stock adapter with minimal agony. note that any time you're inserting or removing the adapter, if you haven't done any sanding and polishing, do not twist it. The slot for the quick strip pin may or may not have burrs which will gall the aluminum of the adapter, the inside of your marker, or both, and effectively swage the adapter inside the body.

Step 1: Remove the O-rings from the adapter. The small o-ring on the velocity adjuster can stay.
Step 2: LUBE THE ADAPTER GENEROUSLY. Use oil at a minimum.
Step 3: Strip everything off the marker. Remove the internals from your marker; bolt, hammer AND valve. You want a clear tube from front to back just in case
Step 4: Attempt to GENTELY insert the adapter into the lower tube on your marker. If you have to use more pressure than you can exert with your off-side pinky finger, STOP and go the special instructions
Step 5: Test fit yuor quick-strip pin
Step 6: If everything fits OK, basically exactly the same as your stock velocity adjuster/plug, remove the adapter, insert the internals, then reassemble. If it's loose, try adding an o-ring. Use the forward first, in case it gets stuck you'll have something to grab onto to try pulling it out. If it's still loose, add the second o-ring. If it's loose after that, buy a lottery ticket, and hope you can get Gunhead to send you the proper item. Once it fits, set velocity, add stock, enjoy

Special Instructions:
So your adapter doesn't seem to fit. First thing to ask is does it seem close? That is, do you not obviously have the wrong adapter for your marker? Gunhead does make several similar products that may or may not have gotten to you because a) they sent the wrong part or b) you hosed your order. If you have an older Spyder, Piranha, etc, make sure you got the part you ordered.

A semi-convienent "feature" of this product is that the velocity adjusting rod is a) thin and b) stiff. This is good because it means you can just chuck the rod into a regular old hand drill, and now the body section of the adapter is now on a mini-lathe. Do so, grab some sandpaper (I started with 320 grit then went up to 600 because my part was obscenely large), wrap the paper around the adapter in a U, and spin up the drill. Take off a little material, wipe/rinse off the dust, re-lube, and repeat the steps above until it slides in nicely. Remeber how your stock plug fits; this part is effectively exactly the same, so you should be shooting for around the same fit. The difference is you have a stock hanging off the other end, so remember that wobbly stocks are bad, and that's what oversanding will get you. Also remember that this is alumnium, so it's going to cut/grind/sand off pretty quickly..and it will also be damaged very easily if you have to hammer/plier it.

It may also be necessary to sand, or possibly even grind or drill, the slot for the quick strip pin. Mine required significant grinding in order to allow the pin to slide through. Remember that if you do any adjustments to the pin slot, you should at the least try to deburr the edges around the OD of the adapter. One more quick pass with very fine grit paper around the entire OD of the adapter would be preferable, just to ensure no material will interfere with your marker tube.

So you got your adapter stuck huh? Way to pay attention! Now what do you do? Well if you followed at least a few of my instructions, you stripped down your marker and removed the internals. Grab a dowel, slide it into your lower tube, and hammer that bad boy out. You may want to use a striker buffer or other piece of semi-rigid material as a buffer between the dowel and face of the adapter, so you don't end up deforming it and making it stuck worse. If you don't have internal access to PUSH the adapter's time to grab some pliers and pray to your diety of choice. Grab onto something that looks sturdy, and start yanking. Things to note The adapter that fits into the stock is ONLY attacked via the set screw which locks down the velocity adjuster rod. If you start twisting it, you're going to do very bad things to the adjuster tube, like crush, twist, and crack it. Yuo may have no choice, but if you absolutely need to grab on here and not the part of the adapter that sticks into the body, pull STRAIGHT OUT and do not twist if possible. This will also just give you gouging from the wrench, but no galling. As I mentioned, once mine was stuck, I had to find a shop with some hefty tools to remove it; worst case you may end up drilling it out or worse, cutting your body to salvage internals. Go slow and try to think of what you will do next if what you're doing now doesn't work.
Conclusion: If you're looking for a "plug and play" stock, you might want to search around for something else that you can just screw on. If you have a tinker spirit and don't mind doing a little minor fit checking and machining, I recommend this item. The design is great conceptually, albeit implemented a bit poorly. Form and Function are good..Fit leaves a little to be desired.

Stock 10/10
Adapter 4/10 (sorry, but anything that can get stuck and permanently disable a marker is well below average)
Overall 7/10
7 out of 10

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