RA-Tech Customer Service Posted January 9, 2009 Report Share Posted January 9, 2009 Dear All, Hello, this is Henry Wang of RA-TECH. We got new product again. RA-TECH aluminum Bolt for GHK-AKS-74U http://www.intrudershop.com.tw/redalert/pi...for_GHK_AK).jpg As my customer service experience, some custmers will tell me that their nozzle is deformed. Therefore, we decied to product the stronger one for you.=] If you got any questions, please be free to contact with by e-mail,ra.ssh5915@msa.hinet.net . Thanks! Best regards, Henry Wang RA-TECH Customer Service Quote Link to post Share on other sites
pedro041484 Posted January 9, 2009 Report Share Posted January 9, 2009 (edited) wow that's nice(aluminum piston & nozzle)..but the bolt carrier itself is brittle.. mine broke..at the screw area, left side. after 2 days of use.. they should make one out of steel.. Edited January 9, 2009 by pedro041484 Quote Link to post Share on other sites
snorkelman Posted January 9, 2009 Report Share Posted January 9, 2009 aye bolt carrier def needs a redesign/better material or both Seen a few folks report snapping at that screw mount, and I've got one where one of the lower tabs has broken off the blowback chamber (lets the piston drop out of place when its fully extended) Casting small 1 or 2mm square unsupported tabs in pot metal dont strike me as too clever from a longevity POV. Quote Link to post Share on other sites
pedro041484 Posted January 10, 2009 Report Share Posted January 10, 2009 yeah the tabs too should be improved Quote Link to post Share on other sites
(V)atrix Posted January 11, 2009 Report Share Posted January 11, 2009 Played with one of these at Blackhole yesterday... I'm no GBB rifle fan by any means - but it was FUN! Also, I really liked how the internals are so similar to the real-steel weapon. As soon as I opened up the dust-cover I was able to recognize and understand almost every component. Definitely will be ordering one in a month or two. Quote Link to post Share on other sites
RedScare Posted January 12, 2009 Report Share Posted January 12, 2009 can you guys take pics of the problem? I am looking at my gun and I am so dense, I cant figure out what you're talking about... Quote Link to post Share on other sites
snorkelman Posted January 12, 2009 Report Share Posted January 12, 2009 (edited) can you guys take pics of the problem? I am looking at my gun and I am so dense, I cant figure out what you're talking about... heres compilation of photos taken from a users post on gas guns info 1st is the broken bolt issue (snaps off where it meets the nozzle and its pin) 2nd is broken bolt carrier issue (snaps off where the brass pins screw into the cast pot metal bolt carrier) 3rd shows the small tabs that can break off the bolt carriers blowback cylinder (theres three in total one at top one towards the bottom at each side) and heres a horrible sketch that I knocked up to show what happens to bolt at full recoil stroke when one of the lower tabs is missing/broken off Edited January 12, 2009 by snorkelman Quote Link to post Share on other sites
The_Boy_Swift Posted January 12, 2009 Report Share Posted January 12, 2009 Interesting - no problems with mine yet. I will be getting the aluminium bolt but it looks like a steel / aluminium bolt carrier might be required. Any chance of that RA-tech? And is there any preventative work that should be done to reduce the chance of a breakage? Perhaps put some rubber sheath around the brass screws to lessen the impact or something? Quote Link to post Share on other sites
IBICO Posted January 12, 2009 Report Share Posted January 12, 2009 Ra-tech got an 10% discount on the alu bolt for gasguns.info members.. just something nice to know about when buying one Quote Link to post Share on other sites
snorkelman Posted January 12, 2009 Report Share Posted January 12, 2009 (edited) chamber tabs - I dont like them (they give me the judders to see teeny bits of pot metal cast unsupported on three sides out of four) but in fairness the only broken one I've seen thus far is on my own. When in the gun they shouldnt be anywhere that would take a knock The main issue looks likely to be when the bolt carriers are getting shipped as components (from GHK to RA from RA to end user etc) as that would be when they were most likely to take a knock against other components in the shipping box. Mine was cracked on lower right hand tab straight out the packet. Only other time they're going to be in a position to take knocks is when you're removing the bolt carrier from the gun etc. Bolt carrier pins - seems to be the less meaty left hand side of the bolt carrier thats been reacting badly in the ones folks have mentioned breaking thus far If you lift up top receiver cover you can see that thats probably exacerbated by the construction of the barrel trunnion at that side of the gun (it really only strikes half of whats already a pretty thin face of the bolt carrier on that side - concentrating the load on an even narrower spot) there isnt really any spare meat on the carrier itself to add a rubber buffer or sleeve the pins, I'm waiting for a hop unit for this one to arrive (was missing from the kit) so can't see wether there'd be room to incorporate a small buffer at base of the recoil spring guide part (or wether thats completely concealed by the hop unit) Inside the front of the casting of the bolt carrier is a recessed area which forms part of the tube the recoil spring guide rod goes thru That might be another candidate for packing with some rubber washers to act as a bump stop Likewise you might be able to glue a small thin strip of rubber inside the barrel trunnion on left hand side - thin enough that it doesnt rub against the side of the bolt carrier, but long enough that it projects back from the barrel trunnion far enough to absorb some of the impact of the bolt carrier striking the trunnion (just a teeny bit projecting out from the trunion - a mm or less) Final option might be a much stronger spring on the interupter/hammer delay/'whatever you want to call it' lever, so that it actually gives a little bit of resistance against the bolt coming back into battery and takes a bit of the sting out of it Course thats assuming: A - that the presence of the interupter on the right hand side of the receiver isnt already reducing load on right hand side of the bolt carrier and transfering it to the left. In which case a stronger interupter spring would just exacerbate that (it provides so little resistance in its stock form though that I doubt it) and B that the extra force then absorbed by the heavier-sprung interupter doesnt end up causing premaure failure in the interupter lever itself lol Edited January 12, 2009 by snorkelman Quote Link to post Share on other sites
The_Boy_Swift Posted January 12, 2009 Report Share Posted January 12, 2009 I have added a buffer onto the recoil rod in a typical Blue Peter fashion - the top funnel end of a Marui AEG loading rod suitably bored out to accept the recoil rod, a cut off recoil spring from a GBB (about 4mm long after trimming, and 2 O-rings over the end of the recoil rod before it goes through the spring and funnel. The funnel had to have one side flattened slightly with a file to fit inside the gas block but the buffer now stops the bolt carrier slamming against the trunnion. Time will tell I suppose....it still shoots fine but has a 1mm gap between the front of the bolt carrier and the front trunnion. I would still eat a steel carrier up for the right price though... Quote Link to post Share on other sites
snorkelman Posted January 12, 2009 Report Share Posted January 12, 2009 sounds like a good workaround did you do it just now or was it one you prepared earlier wuld like to see a steel one meself too (failing that a beefed up machined alloy one with maybe the blowback chamber steel sleeved so the tabs are cut in the steel sleve) Quote Link to post Share on other sites
zero69r Posted January 12, 2009 Report Share Posted January 12, 2009 nice review thanks! Quote Link to post Share on other sites
vbtb110 Posted January 14, 2009 Report Share Posted January 14, 2009 Might have to pick one up, but the stuff breaking might hold me back. Then again I like tinkering, so Quote Link to post Share on other sites
pedro041484 Posted January 14, 2009 Report Share Posted January 14, 2009 mine is still surviving with one screw i just added a rubber band to pull the piston(bolt) back to the bolt carrier.. and I replaced the broken part(left screw area) with a rubber to lessen the impact.. Quote Link to post Share on other sites
aznriptide859 Posted January 14, 2009 Report Share Posted January 14, 2009 RATech just announced a steel bolt assembly for the AK - $40, or -10% for gasguns.info members. Quote Link to post Share on other sites
-FIDO- Posted January 16, 2009 Report Share Posted January 16, 2009 i think its aluminum not steel but thats not bad either =) Quote Link to post Share on other sites
The_Boy_Swift Posted January 18, 2009 Report Share Posted January 18, 2009 Could this be fitted to the GHK AKSU do you think? Might cure the bolt carrier issues. I'm sure you could knock your own up out of some suitable plastic. http://www.midwayuk.com/apps/eproductpage....leItemID=630752 Quote Link to post Share on other sites
snorkelman Posted January 18, 2009 Report Share Posted January 18, 2009 the rubber block inserted ahead of the guide-rod/pistol grip mount on the GHK carries out equivalent function already (rearward point of contact on the airsoft bolt carrier is different from real deal). Seems to be the impact on forward part of the stroke thats causing the wear - e.g. other than a mag or two mines mainly been dry cycled thanks to the leaky mag valve and lack of hop unit, so rearward forces were minimal yet still shows signs of impact wear at front just from allowing the bolt to come back into battery under tension of the spring. I think your buffer at the front mod will probably be the better end to tackle it at Quote Link to post Share on other sites
zeaken Posted January 20, 2009 Author Report Share Posted January 20, 2009 looks like problem one you had snorkleman is the exact same problem i had as it broke the exact same way and everything. my replacement is currently functioning fine but i have plans to upgrade the piston when i get a chance to or this one breaks after the weather breaks and i finally skirm it Quote Link to post Share on other sites
pedro041484 Posted January 21, 2009 Report Share Posted January 21, 2009 my piston finally broke.. any updates on the new aluminum piston? Quote Link to post Share on other sites
-FIDO- Posted January 21, 2009 Report Share Posted January 21, 2009 well you can order it already from GHK mine should be on the way soon Quote Link to post Share on other sites
-FIDO- Posted February 8, 2009 Report Share Posted February 8, 2009 got my aluminum bolt yesterday quality is very very good! its machined precise and nicely black anodized fits perfectly inside the bolt carrier, only the o-ring is very tight fit and doesn't move easily ill try to fit the o-ring from the plastic bolt, maybe this will help but it works perfectly and shoots maybe even better then before (cause of the tight seal i guess) i also noticed that my bolt carrier is broken on one side like some users reported already =/ lets hope ratech will make a bolt carrier of better material soon Quote Link to post Share on other sites
pedro041484 Posted February 9, 2009 Report Share Posted February 9, 2009 I fixed my broken plastic bolt with loctite and epoxy, so far it's doin fine.. showing no signs of breaking down..I'm happy with my gun again hehe Quote Link to post Share on other sites
-FIDO- Posted February 9, 2009 Report Share Posted February 9, 2009 well if anyone needs the stock plastik bolt, i have one here its slightly used of course..but nothing is broken Quote Link to post Share on other sites
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