I have been tinkering around alot lately with both the tanaka m700 base and KJW m700 series. Both have their ups and downs. Right now I am having a local machine shop machine some custom parts for the project. My goal is to reach out as far as possible. Right now unless you upgrade a VSR-10 or APS2 to 600+ FPS, most can Only reach about 250-275ft accurately, at most. At this range, the spring and parts are under alot of pressure and are broken often. With a a gas gun, these problems are aleviated. Gas guns do have their downfall; they are affected by temperature which affects gas pressure, as well as smaller variations in seals and pressure.
Some things to Expect:
-Nitrogen or compressed air powered
-Remote 3000psi tank to dual regulator setup, adjustable up to 700fps or about 150psi.
-VSR10 barrel / hop up based with a PDI cold rolled steel 6.01 555mm inner barrel.
-Either a SCS hopup knub or custom knub
-Custom Delrin barrel spacers with o-rings to absorb vibration
-20-22in outer barrel
-custom 40mmx250mm suppressor w/ baffles and custom adapter built into outer barrel end cap.
-Maximum engagement distance around 450ft
Optics can be included or left out.
The thread is to gauge whether there is an interest locally for a piece like this. It will be an extremely affordable alternative to something like a Right Hook Fabrication rifle that start around $1200 and top out right around $2000.
EDIT: Thanks to whoever moved this.
Update 01/28/10So in my quest to find a local machinist to build one off parts here and there I met a guy named Mike, Mike owns several business including a small machine shop..after getting to know him and getting some ideas of what things might cost..I asked him if he had ever taught anyone and he had..I offered my free apprenticeship services and he obliged. So for the last Month or so I have been watching, working and learning. I finally got to the point where I could make some crafty pieces on my own. And thus, the first piece I can post.
The job was for a custom m700 AICS. The Tanaka outer barrel is crap and is slam extruded by ramming it over a steel or iron rod.. After getting it back to spec I cut the barrel down to length(14.5in) then faced and cut the inside. I then created a 1.5mm 90* chamfer for the cap to sit against.
The cap was created from a round stock of T6-6061 and produce by hand tooling only. No CNC was used. First I drilled the inner barrel hole, then started making cuts and passes on the outer surfaces. Then I used the mill to cut the 14mm negative threading..This took about nine passes and some help from my mentor. next came outer reliefs for the O rings that would seat the cap into the outer barrel. The last part I had to wait for because I had to order a special relief tool for the inner reliefs. Once I got this I cut the inner reliefs for the inner barrel O rings.
The final product is within .0015 tolerances and a VERY tight fit into the outer barrel and inner barrel. This was done purposefully to avoid any movement or having to use barrel spacers.
I have not polished the end cap yet So tooling marks are still there, and the junk all over it is DOW 55, an oring lube/sweller.
Update 1/29/10Finally got around to fitting it up. Very snug, no play what so ever with a 290mm suppressor. Usually I like to 'cold press' these types of pieces into place. For anyone unfamiliar with that process, you machine the pieces to the same spec, then freeze the piece going inside with liquid nitrogen and push it in..Once you get around 50 below, the pieces are there for good.
Update 2/18/10
Been working on some new magazine and trigger parts.
Chrono Results from the last few trials.
Stock trigger group/upgraded bolt/G&G magazine parts/303mm pdi 6.01/40psi HPA/Bioval .27 BBBMAX
Fps is measured in .27 weight.
332
339
334
329
334
330
322
338
340
333
Not bad but a pretty large spread.
Stainless cryo treated sear and trigger pieces/upgraded bolt/G&G magazine parts/303mm pdi 6.01/40psi HPA/Bioval .27 BBBMAX
Fps is measured in .27 weight.
352
353
355
355
350
352
354
352
355
350
Well that is a little better..
Stainless cryo treated sear and trigger pieces/upgraded bolt/custom magazine parts lubed with DOW 111/303mm pdi 6.01/40psi HPA/Bioval .27 BBBMAX
Fps is measured in .27 weight.
368
366
368
368
368
370
366
370
370
369.
Much, Much better.
Although cryo treating the trigger parts isn't needed, it seems to keep the consistency up quite a bit due to the hardness of the contact surfaces.