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Air Gun Home Forum Index » Rifles » Stock Screws & inaccuracy    View previous topic :: View next topic  Stock Screws & inaccuracy   Posted: Wed Feb 17, 2010 7:11 pm donec Senior Member Joined: 19 Dec 2009 Posts: 836 Location: central Texas Pflugerville area Can loose Stock Screws cause the same inaccuracy in fixed barreled rifles as they do in break barrel rifles?   Posted: Wed Feb 17, 2010 7:20 pm Lipoly Veteran Member Joined: 06 Dec 2009 Posts: 241 Location: St. Louis, MO, USA Given you hold the gun by the stock; and the barrel is wiggling around inside the stock due to loose screws, I'd have to say it would cause problems. _________________ Philip RWS 350 .22 w/Leapers 4-16x50 Crossman 1377   Posted: Wed Feb 17, 2010 7:25 pm donec Senior Member Joined: 19 Dec 2009 Posts: 836 Location: central Texas Pflugerville area Thanks Philip, you know I had not thought of it like that.   Posted: Wed Feb 17, 2010 8:00 pm broommaster2000 Moderator Joined: 10 Mar 2007 Posts: 5714 Location: City of Groningen, Groningen, The Netherlands I'd say anything that feels wobbly about an airgun is generally pretty bad. _________________ BIG GAP   Posted: Wed Feb 17, 2010 8:11 pm sniper Silver Status Member Joined: 28 Nov 2008 Posts: 3752 Location: Star, Idaho you can use some loctite. generally it's good to run over a springer with a screw driver every few hundred rounds. i do. if they come even slighty loose you'll get enough vibration to shift your POI. _________________ I believe in gun control, If there's a gun around I want to be controlling it.......   Posted: Thu Feb 18, 2010 11:31 am Teryx Veteran Member Joined: 17 Mar 2009 Posts: 119 I'm sure that airguns are gun specific, but powder guns are very sensitive to not only loosenes, but the actual torque on the screw. I use an inch pound wrench to set all of mine. Teryx   Posted: Thu Feb 18, 2010 7:16 pm donec Senior Member Joined: 19 Dec 2009 Posts: 836 Location: central Texas Pflugerville area Teryx wrote: I'm sure that airguns are gun specific, but powder guns are very sensitive to not only loosenes, but the actual torque on the screw. I use an inch pound wrench to set all of mine. Teryx How do you know the proper torque value?   Posted: Thu Feb 18, 2010 11:19 pm Teryx Veteran Member Joined: 17 Mar 2009 Posts: 119 Donec, Mostly it's trial and error, but the main thing is that it's always the same. I have one rifle that I can shift the POI by 2 or 3 inches at 100 yards by tweaking the stock screw over what would feel like a normal range. I generally go with the lowest torque that secures the action and keep it there. In that case it's 18inch pounds. I'm working on a new stock for that one that is pillar bedded so it will be far less sensitive. A little torque screw driver is a very good tool to have. Teryx   Posted: Thu Feb 18, 2010 11:25 pm donec Senior Member Joined: 19 Dec 2009 Posts: 836 Location: central Texas Pflugerville area Teryx wrote: Donec, Mostly it's trial and error, but the main thing is that it's always the same. I have one rifle that I can shift the POI by 2 or 3 inches at 100 yards by tweaking the stock screw over what would feel like a normal range. I generally go with the lowest torque that secures the action and keep it there. In that case it's 18inch pounds. I'm working on a new stock for that one that is pillar bedded so it will be far less sensitive. A little torque screw driver is a very good tool to have. Teryx Is that 18inch pounds for a specific rifle or a specific stock like synthetic or wood?   Posted: Sun Feb 21, 2010 11:48 pm Teryx Veteran Member Joined: 17 Mar 2009 Posts: 119 donec wrote: Teryx wrote: Donec, Mostly it's trial and error, but the main thing is that it's always the same. I have one rifle that I can shift the POI by 2 or 3 inches at 100 yards by tweaking the stock screw over what would feel like a normal range. I generally go with the lowest torque that secures the action and keep it there. In that case it's 18inch pounds. I'm working on a new stock for that one that is pillar bedded so it will be far less sensitive. A little torque screw driver is a very good tool to have. Teryx Is that 18inch pounds for a specific rifle or a specific stock like synthetic or wood? The torque required is a function of the stock design, reciever design, and stock material. The one stock that was so easily affected was an inexpensive plastic stock. Any stock where the action is being sucked into a void by the stock screw is going to be senistive to some extent. That is why pillar bedding is used on virtually all high end target or long range rifles. I'm speaking primarily about powder rifles, but some air rifles could suffer as well depending on design. My Mrod for instance attaches to the stock by the airtube, and not the action directly. The airtube is a massive structure as well. I haven't seen any sensitivity in that rifle to stock screw tension within reason. I could imagine though that a springer might be more sensitive. I've seen enough problems over the years related to stock screws that I just view torquing them as a matter of good hygene, like showering at least once a week, even if I smell fine As I said though, within reason, the actual torque is not as imporatnt as getting it the same every time. Teryx   Posted: Mon Feb 22, 2010 1:28 am donec Senior Member Joined: 19 Dec 2009 Posts: 836 Location: central Texas Pflugerville area Teryx wrote: donec wrote: Teryx wrote: Donec, Mostly it's trial and error, but the main thing is that it's always the same. I have one rifle that I can shift the POI by 2 or 3 inches at 100 yards by tweaking the stock screw over what would feel like a normal range. I generally go with the lowest torque that secures the action and keep it there. In that case it's 18inch pounds. I'm working on a new stock for that one that is pillar bedded so it will be far less sensitive. A little torque screw driver is a very good tool to have. Teryx Is that 18inch pounds for a specific rifle or a specific stock like synthetic or wood? The torque required is a function of the stock design, reciever design, and stock material. The one stock that was so easily affected was an inexpensive plastic stock. Any stock where the action is being sucked into a void by the stock screw is going to be senistive to some extent. That is why pillar bedding is used on virtually all high end target or long range rifles. I'm speaking primarily about powder rifles, but some air rifles could suffer as well depending on design. My Mrod for instance attaches to the stock by the airtube, and not the action directly. The airtube is a massive structure as well. I haven't seen any sensitivity in that rifle to stock screw tension within reason. I could imagine though that a springer might be more sensitive. I've seen enough problems over the years related to stock screws that I just view torquing them as a matter of good hygene, like showering at least once a week, even if I smell fine As I said though, within reason, the actual torque is not as imporatnt as getting it the same every time. Teryx I understand but where do you find the torque values if you want to torque the screws down?   Posted: Mon Feb 22, 2010 10:24 am Teryx Veteran Member Joined: 17 Mar 2009 Posts: 119 The manufacturers should have torque values. I would check with them first. If you can't get that info from them you are on your own. Most will fall between 15 and 30 inch pounds. For most people that will feel like too little because they are used to getting some real a$$ behind the screwdriver. 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