AnotherJesus Posted June 22, 2010 Report Share Posted June 22, 2010 Barrel choice is ultimately up to you. But at such high FPS, I'd like to suggest you keep to a 6.03, or my personal choice, a 6.05. If you've had good results with a 6.01 though, don't let me stop you. A ported cylinder would useually be a good idea with a carbine length barrel, but seeing as you're useing .4g bbs, it might not help. Regular cylinder portings and the like kinda go out the window when you get the FPS up high, and use different ammo weights as well. Trial and error is the best option. I guess if you can afford a new front end, you can afford the $15 for a new cylinder. Link to post Share on other sites
sniperelite7 Posted June 23, 2010 Report Share Posted June 23, 2010 Alright, but would their be a performance decrease in the range and accuracy category? Or is that all hopup related unless of course I go super stubby. Link to post Share on other sites
AnotherJesus Posted June 23, 2010 Report Share Posted June 23, 2010 You should be able to keep performance close to what it is now. I wouldn't be suprised if there was a 10-20fps drop. I wouldn't expect anything more than that. Range shouldn't decrease any, and accuracy could well increase or decrease. It's hard to say. That would depend as much on the bore of the barrel as the length of it anyway. Edit: And of course the quality of the barrel makes a big difference to accuracy. There's many factors. I wouldn't like to pin accuracy increase or decrease purely on the barrel length, that would be unfair. Link to post Share on other sites
banjo Posted June 23, 2010 Report Share Posted June 23, 2010 Alright, but would their be a performance decrease in the range and accuracy category? Or is that all hopup related unless of course I go super stubby. You will probably find your accuracy will increase and the range will drop, but not by any great margin to worry about. If you go super stubby you will lose range, accuracy and power, lots of it, but you will gain noise, absalute minimum for an accurised AEG is a 363mm barrel, Ive found anywhere between 400 and 450 to be optimum in my setups. If it was me I'd short stroke it by 1 or 2 teeth and re boost the spring tension with a spacer the same thickness as the teeth you removed, I'd probably re-balance the volume of the cylinder to the barrel by x1.7 to allow for the heavier ammo, and I wouldn't use a barrel any less than 6.03 for definate, getting a 6.04 or .05 if possible/ 400mm in length. Link to post Share on other sites
Lone_Bullet Posted June 23, 2010 Report Share Posted June 23, 2010 Just a Q, I have a KWA KM16 SR12. Planning a KM 6.04. Standard length is 502mm and I 'd like to buy a 502mm TB as I'll be able to use my borelaser to set my scope. Now I see that the optimal lenth is between 420 and 480 ish. What would a longer barrel do? Would it have a neg. effect on accuracy, etc. Or would it just have no effect? Thanks Ps. Yes, I'm planning to follow the guide Link to post Share on other sites
banjo Posted June 24, 2010 Report Share Posted June 24, 2010 A longer barrel has the BB in it for longer, so is open to having interference in travel by the operator for longer, ie, when you shoot theres more chance for you to move and send the shot not exactly where you wanted it to when you initialy pulled the trigger. A shorter barrel reduces this, which is why they can often be precieved more accurate, longer barrels upto 509mm are really the domain of fixed and solidly supported BA systems, everything over 509mm is just a good way to gain fps and lose accuracy, nothing more. As you plan to use a barrel thats only 20mm longer than I'd use, I wouldn't be conserned about any noticable bad effects, it will only mean that your compression system will not be operating at its full potential if you plan to use heavier ammo etc etc. Link to post Share on other sites
Lone_Bullet Posted June 24, 2010 Report Share Posted June 24, 2010 I plan to use .27, so I guess it won't be much of a problem then. Thanks a lot! Link to post Share on other sites
Short Stack Posted July 18, 2010 Report Share Posted July 18, 2010 Hai guys! It seems I can get a hold of a Real Sword SVD with a scope. I plan on upgrading it to 250-300 foot range. I know that the Madbull black fishbone bucking works best, and so do pdi springs. I might switch over to a 6.03mm TBB if the gun is too inaccurate.(If I can find one in 690mm) The gearbox and motor is just fine, But what battery? It seems 9.6v works best. Link to post Share on other sites
SteevoLS Posted July 18, 2010 Report Share Posted July 18, 2010 I would personally use a small lipo. You can get a lipo that puts out just as much power as an equivalent 9.6, but the size will be smaller. Link to post Share on other sites
banjo Posted July 19, 2010 Report Share Posted July 19, 2010 I would personally use a small lipo. You can get a lipo that puts out just as much power as an equivalent 9.6, but the size will be smaller. I to would use a lipo, but not for the above reason, though it is very valid. A lipo is actualy more efficient and kinder to motors, allowing them to work at there peak 90% of the time, that to us one shot wonder boys with a properly sorted AEG DMR is the bestest ever Link to post Share on other sites
Trasher Posted July 19, 2010 Report Share Posted July 19, 2010 Hai guys! It seems I can get a hold of a Real Sword SVD with a scope. I plan on upgrading it to 250-300 foot range. I know that the Madbull black fishbone bucking works best, and so do pdi springs. I might switch over to a 6.03mm TBB if the gun is too inaccurate.(If I can find one in 690mm) The gearbox and motor is just fine, But what battery? It seems 9.6v works best. Mine cycled a 580fps spring easily with a small 11v 20c 1600mah lipo. A tightbore will not help you to get better accuracy, the Real Sword SVD's main problem is the hopup unit. Good luck with the 250-300 feet, you'll need it. Link to post Share on other sites
counterassasin Posted July 19, 2010 Report Share Posted July 19, 2010 Also worth noting, is the extra gear on the RS SVD. Don't expect the snappy response of a regular AEG running a 3c Lipo. I've tried all kinds of batteries, from 2c and up to 3c, the lag will still be there. Also found mine to be more accurate with a 455mm AK Prometheus 6.03 barrel than the stock 690mm one. Link to post Share on other sites
sniperelite7 Posted July 20, 2010 Report Share Posted July 20, 2010 Talking to a guy he mentioned that you can find the appropriate BB weight by using these two equations. fps/1200 for max BB wieght and fps/1600 for minimum. I dunno if it is compatible with the optimum flight for a BB is 380 fps. I have to test. However I have my m16a4 dmr tuned up. Its shooting at around 476-482 thats a 3.5 variance in fps. I personally feel thats as good as its going to get . Whats your opinions on running .40g ammo? According to that equation its about perfect. However I dunno if madbulls are going to get too expensive on me. Link to post Share on other sites
scar527 Posted July 20, 2010 Report Share Posted July 20, 2010 i'd give em a go, i think you'll get some good performance, and if they get too expensive then go to .3's. as long as you hopup can apply enough hop to give the .4's a level trajectery, you should be golden. Link to post Share on other sites
slicedvomit Posted July 20, 2010 Report Share Posted July 20, 2010 Just to recycle the photo link on page 4, since I can't edit the post (right?): Link to post Share on other sites
sniperelite7 Posted July 20, 2010 Report Share Posted July 20, 2010 Awesome, thats the perfect picture for DMR's. Just ranged in today, I can hit up to 230 ft torso sized. But I've been coming across a problem. at long distances the BB's starting curving sideways sometimes they curve right, sometimes fly straight, alot of the times they curved left. It seemed that they flew straight out of the barrel but observing through the scope they would curve at a certain point down range. Now i've shimmed my hopup arm, still has a little side to side play but it isn't dramatic and i've gone through great pains to ensure that my hop arm is filed level. I am using a new systema bucking with a prommy purple nub as well. I personally suspect that its the BB's. Madbull .40g. Being around the community for awhile it seemed that people just dont really like them that much due to quality. Link to post Share on other sites
scar527 Posted July 20, 2010 Report Share Posted July 20, 2010 bioval makes precision .4's but they are 15 bucks for 500. try using lighter weights and see if you can replicate the problem. if not, then its the bb's Link to post Share on other sites
sniperelite7 Posted July 20, 2010 Report Share Posted July 20, 2010 I'll try, I have some bbking .32s i'll test out. Bioval's .40s are just rebranded madbulls I think. I saw a reveiw on asr. They had airbubbles amongst other things, not even centered airbubbles as well. Same color as the madbulls as well. Link to post Share on other sites
scar527 Posted July 20, 2010 Report Share Posted July 20, 2010 well then, the cheap B*stards lol i wont be buying any of those anytime soon. Link to post Share on other sites
Vassily Posted August 9, 2010 Report Share Posted August 9, 2010 Hey sniper haven, long time no see! I have been tempted by this route myself, since my local site is a total hosefest and being a (spring) BA is asking for trouble! Firstly, i must say, banjo your guide is superb and has cleared up a lot of my intial uncertantys and gaps in understanding. Greatly tempted in making my already accurate Ak into a DMR varient (Tabuk or Zastava), but thats by the way as i first just want to get the internals doing the job in its current external guise. At my site, bolt actions can do 500, fixed semi's 420, and autos 350 1.) Im interested if anyone has considered having a 'AEG' precocking to a button press and firing on trigger shot, then recocking on button press. I know it sounds unusual, but surely that would classify it as a bolt action (seperate action required for cycling) and therefore allow 500fps rather than the 420. 2.) A second crazy idea i have thought is where some (from the top of my head, i beleve the ARES tar21 is one) AEGS have variable FPS, so why not fit this to a DMR? or why not further this and have the FPS set at 420 on single, and combine the action of switching to auto reduce the FPS to 350, would this comply with the uk law? Sorry if either or both seem a bit hairbrained lol Cheers, Vassily Link to post Share on other sites
Wisey Posted August 9, 2010 Report Share Posted August 9, 2010 I've thought about your first idea before, but the second one sounds quite interesting. I look forward to seeing what people come up with! Link to post Share on other sites
ghostsniper995 Posted August 18, 2010 Report Share Posted August 18, 2010 Interesting ideas, but as a site owner I would be quite skeptical about letting you use either, what if the system fails and you hose some poor kid at 420fps? Link to post Share on other sites
Vassily Posted August 19, 2010 Report Share Posted August 19, 2010 True, we would have to see how reliable the system used to limit the fps is. Maybe it would be easier to have a small AEP mounted on the DMR for that purpose.... Link to post Share on other sites
sniperelite7 Posted August 30, 2010 Report Share Posted August 30, 2010 Clocked my dmr in, its shooting at 480 fps +/- 3.5 fps. Is that considered good? Link to post Share on other sites
scar527 Posted August 31, 2010 Report Share Posted August 31, 2010 Uhhhhhh Thats really really good. What platform are you using.give you or whoever did the work on that a pat on the back. I have heard of some more consistant but you have a winner right now i wouldnt mess with it. Link to post Share on other sites
Recommended Posts
Archived
This topic is now archived and is closed to further replies.