Salty6924 Posted August 20, 2010 Report Share Posted August 20, 2010 SI purchased my ACR PTS and have noticed but one problem with it. My Hop-Up fails to work at all now that the rifle has had about 5000 rds put through it. I have replaced the rubber, though little wear was on the stock one, and have had no luck. The bucking is proprietary and cannot be replaced but I suspect it it the cause. My question is this, has anyone else experienced this problem, and if so have you found a solution. I will work on a fix during the next few days and post my results. As this is the only issue I have had with what I consider the first perfect airsoft rifle ever released, I am eager to find a quick and painless fix. I will post a guide for the fix if found. Cheers fellow techs from across the pond and around the world. Link to post Share on other sites
Apocalypsemeow Posted August 20, 2010 Report Share Posted August 20, 2010 First thing I can think of is trying some different types/weights of ammo. My hop-up on my SCAR despises anything lighter than .25 Does anyone have pictures of the hop unit? Would be interesting to see, so far all I've seen is the rubber in the barrel. Link to post Share on other sites
Salty6924 Posted August 20, 2010 Author Report Share Posted August 20, 2010 First thing I can think of is trying some different types/weights of ammo. My hop-up on my SCAR despises anything lighter than .25 Does anyone have pictures of the hop unit? Would be interesting to see, so far all I've seen is the rubber in the barrel. I'm currently working a double but I can post pics in about 12-36 hours :/ The hop up problem isn't with its reliability, it just doesn't function at all now, though all looks fine inside and out. BBs just drop instead of smooth sailing into the backdrop. Heavier BBs would just make it worse I think, I will try though just for S&G. Link to post Share on other sites
mimesis Posted August 20, 2010 Report Share Posted August 20, 2010 The hop up problem isn't with its reliability, it just doesn't function at all now, though all looks fine inside and out. BBs just drop instead of smooth sailing into the backdrop. Heavier BBs would just make it worse I think, I will try though just for S&G. So when you turn the hop-up adjustment wheel, while looking down the inside of the inner barrel, you can see the "bump" on the inside of the bucking moving up and down in accord with how the wheel is adjusted? Link to post Share on other sites
BerserkDS Posted August 20, 2010 Report Share Posted August 20, 2010 Is your barrel cleaned or.over lubed? That's happened to.me in the past Link to post Share on other sites
Salty6924 Posted August 21, 2010 Author Report Share Posted August 21, 2010 Is your barrel cleaned or.over lubed? That's happened to.me in the past barrel is clean, hopup is clean as well. the bucking is moving, it seems to fix itself when I take out the interchangable barrel and then it stops working a few hundred rounds later. maybe alignment? ill do some more testing and get back. I'm planning on reviewing this rifle, I want to make sure this isn't my fault before putting it in the review. Link to post Share on other sites
Sacair Dagger Posted August 21, 2010 Report Share Posted August 21, 2010 The bucking for the PTS is not proprietary. Any standard AEG bucking will fit. With the outer barrel assembly removed, I would function check the hop adjustment arm and physically see that it is moving up and down. If that works, it's most likely the bucking you are using. If not, you may have lost a piece of the hop lever/nub when the outer/inner barrel was removed. Good Luck. Link to post Share on other sites
Salty6924 Posted August 22, 2010 Author Report Share Posted August 22, 2010 The bucking for the PTS is not proprietary. Any standard AEG bucking will fit. With the outer barrel assembly removed, I would function check the hop adjustment arm and physically see that it is moving up and down. If that works, it's most likely the bucking you are using. If not, you may have lost a piece of the hop lever/nub when the outer/inner barrel was removed. Good Luck. My bucking is in tact, and on the PTS ACR the bucking is captured into the Lever, this prevents it from falling out when you change out your barrel. I will take some pics when I get a day off. I have noticed that the barrel is also not standard, though I can probably use one. When I say its nit standard, I mean the hop up slot is not of the standard dimensions. Link to post Share on other sites
Salty6924 Posted August 31, 2010 Author Report Share Posted August 31, 2010 My bucking is in tact, and on the PTS ACR the bucking is captured into the Lever, this prevents it from falling out when you change out your barrel. I will take some pics when I get a day off. I have noticed that the barrel is also not standard, though I can probably use one. When I say its nit standard, I mean the hop up slot is not of the standard dimensions. Update, The issue has been worked out. First here is a picture of the Proprietary Bucking, its the rubber bit that looks like the number 8. Unfortunately That means if you loose or ruin this bucking, you must either make a new one, or wait for Magpul to release spares. Luckily the barrel "IS" a standard AEG barrel. Now for the cause and solution to the problem. As you all know the ACR PTS from Magpul has a quick change barrel. This barrel Contains 1/3rd of the Hop up. The Adjustment Mech is in the Upper receiver, Along with the bucking which is clearly exposed when you pull out the barrel. IF you replace the barrel with the Hop Up ON at all, It will not function when you attempt to fire. So, One must Turn the hop up Off all the way before swapping or removing and replacing the Quick Change barrel. Thanks for all of your help everyone. 1+ to all. Link to post Share on other sites
WTF?Shane Posted August 31, 2010 Report Share Posted August 31, 2010 Good info, though I think there's a mix up of terminology. Bucking is usually referred to the hop up rubber, and the 'figure 8' part in the Masada ACR would be the hop up nub. Link to post Share on other sites
Salty6924 Posted August 31, 2010 Author Report Share Posted August 31, 2010 Ah I had always refers to the rubber as packing, and the nub as bucking. Thanks for the correction. Link to post Share on other sites
Sgt Bob IE Posted September 3, 2010 Report Share Posted September 3, 2010 I found with mine, that the hop up adjustment was very slight, had to pretty much have it all the way on to work right for .25s. So what I did was took an old hop up rubber and cut a sliver off and fit it in the slot on the barrel where the hop up nub presses down, gave me much better adjustment. Link to post Share on other sites
Salty6924 Posted September 4, 2010 Author Report Share Posted September 4, 2010 If you could post a picture of that fix that would be great because as you mentioned the Hop Up is very dissapointing on the ACR Link to post Share on other sites
Sgt Bob IE Posted September 4, 2010 Report Share Posted September 4, 2010 If you could post a picture of that fix that would be great because as you mentioned the Hop Up is very dissapointing on the ACR Sure Basically what you see is the way the masada came, what I did was took an old hop up rubber, cut a sliver of to fit in where the arrow is pointing, and that gave me a bit more play on the hop up. Just turn your hop completely off before putting any bbs through it, as depending on your hop, this sliver may cause too much hop up. It helped me, but may not work for everyone. Link to post Share on other sites
mimesis Posted September 4, 2010 Report Share Posted September 4, 2010 Great photo! Is the nub the common-and-garden flat style (like a small piece of insulation stripped off the end of some wire)? Presumably you could also build up the bucking a little with superglue or whatever, on the outside right where the bump/mound is on the inside (again, great photo). Link to post Share on other sites
Salty6924 Posted September 4, 2010 Author Report Share Posted September 4, 2010 Sure Basically what you see is the way the masada came, what I did was took an old hop up rubber, cut a sliver of to fit in where the arrow is pointing, and that gave me a bit more play on the hop up. Just turn your hop completely off before putting any bbs through it, as depending on your hop, this sliver may cause too much hop up. It helped me, but may not work for everyone. I use .28 bbs. Worked great for me Link to post Share on other sites
Sgt Bob IE Posted September 4, 2010 Report Share Posted September 4, 2010 Great photo! Is the nub the common-and-garden flat style (like a small piece of insulation stripped off the end of some wire)? Presumably you could also build up the bucking a little with superglue or whatever, on the outside right where the bump/mound is on the inside (again, great photo). All credit for the photo goes to Scuffer, it's from his review thread. Unfortunately my Masada is been looked at by the techs. Trigger issues. If you mean the nub on the hopup arm. It is a figure of 8 style nub, same as the TAR-21 from Ares. As far as I know. There are options on how you want to build up the nub, but the option I gave was a quick and simple fix for me. I use .28 bbs. Worked great for me Glad to hear it! Link to post Share on other sites
Salty6924 Posted September 5, 2010 Author Report Share Posted September 5, 2010 All credit for the photo goes to Scuffer, it's from his review thread. Unfortunately my Masada is been looked at by the techs. Trigger issues. If you mean the nub on the hopup arm. It is a figure of 8 style nub, same as the TAR-21 from Ares. As far as I know. There are options on how you want to build up the nub, but the option I gave was a quick and simple fix for me. Glad to hear it! What other options are there. Here's what I have currently done. I upgraded to a madbull 60% rubber, then cut a sliver from the spare in the package to perfectly fit that slit in the pic and used a dab of crazy glue to keep it in place, works well but I would love to hear of the alternatives and play around with them. Link to post Share on other sites
GingaNinga Posted September 8, 2010 Report Share Posted September 8, 2010 I am having trouble with the BB always curving to the right. How do you get the hop-up nub out of the receiver? I think I need to re-seat it. I have changed the bucking with a Guarder 50% type. Link to post Share on other sites
xPLAN303Ex Posted October 10, 2010 Report Share Posted October 10, 2010 Sure [picture] Basically what you see is the way the masada came, what I did was took an old hop up rubber, cut a sliver of to fit in where the arrow is pointing, and that gave me a bit more play on the hop up. Just turn your hop completely off before putting any bbs through it, as depending on your hop, this sliver may cause too much hop up. It helped me, but may not work for everyone. Is the sliver on the outside or inside of the barrel? What did you use to glue it? Link to post Share on other sites
Sgt Bob IE Posted October 10, 2010 Report Share Posted October 10, 2010 I literally placed it sitting on top of where the arrow is pointing. I didn't glue it. I just carefully put the barrel back in. Link to post Share on other sites
Salty6924 Posted October 10, 2010 Author Report Share Posted October 10, 2010 Here is a photo of the peice of rubber i have glued in place. Most Rubbers come in packs of two, so i used the spare for the mod. Here is a photo of how i exactaly glued it in place, Where you place the glue is important and determines wheather or not the hopup will work after the mod. I used Super Glue, just a drop. Link to post Share on other sites
mimesis Posted October 10, 2010 Report Share Posted October 10, 2010 What keeps the nub in place up inside the housing that the barrel/bucking fits into? What is it attached to or held by? Link to post Share on other sites
The Reptile House Posted October 10, 2010 Report Share Posted October 10, 2010 The nub is a figure eight shape, half of it is enclosed by the hop arm. Link to post Share on other sites
xPLAN303Ex Posted October 11, 2010 Report Share Posted October 11, 2010 Here is a photo of the peice of rubber i have glued in place. Most Rubbers come in packs of two, so i used the spare for the mod. Here is a photo of how i exactaly glued it in place, Where you place the glue is important and determines wheather or not the hopup will work after the mod. I used Super Glue, just a drop. Thanks for the info. Additional question, when I remove the lower receiver to take a look, the hopup is pretty loose in the upper receiver. Is that normal? Link to post Share on other sites
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