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Air Gun Home Forum Index » Airgun Smithing » LDC adaptation.....    View previous topic :: View next topic  LDC adaptation.....   Posted: Sat Oct 30, 2010 6:24 pm packrat Senior Member Joined: 16 Nov 2009 Posts: 882 Location: Out in the woods...Ellabell, GA. My AA S410 has factory shroud 19" long...barrel is 15.5 " long...shroud is not as effective as I would like...OD of shroud is 0.625"....can't I just slip an LDC over the shroud that has an ID of 0.626"-0.6247" ??? I could even shorten shroud by say 4.5 " and then attach LDC, to keep O.A.L. to a minimum. I don't see any safety issues here, but just to be sure, I'm asking here..what say ye men?? YES...ldc would be for same caliber as the gun..... _________________ HEY !! This getting old thing is NOT for sissies...   Posted: Sun Oct 31, 2010 9:39 am Alstone Moderator & Site Supporter Joined: 01 Mar 2007 Posts: 4139 Location: Linconshire, ENGLAND The problem you have packrat is lack of volume in front of the muzzel to kill of the crack when firing, for a .22 at 12 flb you need a LDC 8"long X 1.25" diameter. As you have a shrouded barrel already you don't need more than a couple of baffels in it. As I said the key to LDCs is the length in front of the muzzel, if you keep it at 0.625 then you would need 12" at least. Al _________________   Posted: Sun Oct 31, 2010 3:56 pm Bozo Veteran Member Joined: 29 Jun 2009 Posts: 107 Location: The remote parts of El Dorado County, CA What's an LDC? _________________ Sheridan Blue Streak , Barska Red Dot sight, .20 Gamo Big Cat 1200, 4x32 Ruger scope, .177   Posted: Sun Oct 31, 2010 7:16 pm Alstone Moderator & Site Supporter Joined: 01 Mar 2007 Posts: 4139 Location: Linconshire, ENGLAND Bozo wrote: What's an LDC? "LDC" means (Lead Dust Collector) or a north American term for a silencer, as the word "Silencer" attracts to much controversy over there. A lot of people think that silencers are illegal in the USA but you can get a licence for one for about $200.00, it must be part of the gun and not removable as far as I understand the law. Al _________________   Posted: Sun Oct 31, 2010 7:31 pm packrat Senior Member Joined: 16 Nov 2009 Posts: 882 Location: Out in the woods...Ellabell, GA. Thanks Al....that's the sort of info I needed..On the US version the shroud is "bonded " to the breech apparently, and NOT threaded on the muzzle end. It actually is "neighbor" friendly as is, but I would prefer it to be a few decibels lower......(personal preference) I was thinking if I removed -3 inches(rather than the "4-4.5 " I had posted earlier!) of shroud, and then installed 6" LDC (1" OD) it would provide the desired effect. I also considered drilling 2 more holes in rear of shroud, to match the existing 2 holes in it (from factory) but have no idea if that would help provide the desired result??? Have any knowledge of how that would work ?? _________________ HEY !! This getting old thing is NOT for sissies...   Posted: Sun Oct 31, 2010 8:57 pm Bozo Veteran Member Joined: 29 Jun 2009 Posts: 107 Location: The remote parts of El Dorado County, CA Thank you; I figured out all the other acronyms, but that one had me stumped! I like it, though, very appropriate. _________________ Sheridan Blue Streak , Barska Red Dot sight, .20 Gamo Big Cat 1200, 4x32 Ruger scope, .177   Posted: Mon Nov 01, 2010 5:17 am Alstone Moderator & Site Supporter Joined: 01 Mar 2007 Posts: 4139 Location: Linconshire, ENGLAND packrat wrote: I also considered drilling 2 more holes in rear of shroud, to match the existing 2 holes in it (from factory) but have no idea if that would help provide the desired result??? Have any knowledge of how that would work ?? They put these bleeder holes in the back of the shroud to lower the air pressure, this encourages some of the blast/noise to be dissipate into the shroud. Putting extra holes in the shroud may help but it will be a hit and miss operation, if you over do it, it will make the noise louder then you will have to thread the holes and plug them with a screw. Personally I wouldn’t drill extra holes as it really is a one way trip, with limited ways of reversing the operation. Just one thought does the shroud have baffles at the front? if not you could try fitting a couple of cone type baffles to encourage the blast to expand in the shroud. Al _________________   Posted: Mon Nov 01, 2010 8:55 am 1377x Member Joined: 03 Mar 2010 Posts: 38 Location: upper midwest usa why not just make a shroud extender? i saw that tko or one of the custom parts makers made an extension for the marauder shroud   Posted: Wed Nov 03, 2010 7:37 pm packrat Senior Member Joined: 16 Nov 2009 Posts: 882 Location: Out in the woods...Ellabell, GA. Thanks for the ideas/suggestions..AL- as far as I can see, there are NO baffles in the shroud,other than what appears to be 1 metal washer about 1/3 of the way down...... I asked this same question on the AAOC forum.. found some folks that have shortened their shrouds and fitted "cans" over the front...Evidently this is very effective..and like i said earlier, I prefer the look of the "can" to the full sgroud anyway, so looks like my problem, as it were, is solved..Just waiting on the LDC I've ordered (un-assembled) to get here now _________________ HEY !! This getting old thing is NOT for sissies...   Posted: Sat Nov 13, 2010 7:41 pm packrat Senior Member Joined: 16 Nov 2009 Posts: 882 Location: Out in the woods...Ellabell, GA. Got the LDC from Charlie, filled it with some lead-dust collecting material and seperated it into 2 chambers.....NOW it is more effective than the Super 10 advertisement as shown on the AOA website ad for BSA guns Bought 4 1/2 ldc..it slips on over end of shroud...looks so good I'm not even going to shorten the shroud!! You can see it mounted in this picture..... _________________ HEY !! This getting old thing is NOT for sissies...   Posted: Sun Nov 14, 2010 4:31 am Alstone Moderator & Site Supporter Joined: 01 Mar 2007 Posts: 4139 Location: Linconshire, ENGLAND I looks very European now and the visual balance looks about right, also if it does what you wanted then you’ve got it cracked. You can chuck all your other guns away now. Nice job. Al _________________   Posted: Sun Nov 14, 2010 10:03 am 1377x Member Joined: 03 Mar 2010 Posts: 38 Location: upper midwest usa looks good and works congrats,job well done   Posted: Tue Nov 16, 2010 7:36 pm packrat Senior Member Joined: 16 Nov 2009 Posts: 882 Location: Out in the woods...Ellabell, GA. It is now MORE "neighborhood friendly" than the advertisement for the BSA Super Ten on the AOA webiste.. truly "mouse fart quiet". And Al, thanks for the compliment about it looking "European" like I said before I really like the looks of the "big can " on the end of barrel..always have. Total cost for all that was less than $30.00-yeah baby !! _________________ HEY !! This getting old thing is NOT for sissies...   Posted: Wed Nov 17, 2010 5:50 am broommaster2000 Moderator Joined: 10 Mar 2007 Posts: 5714 Location: City of Groningen, Groningen, The Netherlands Best stuff in life comes at a price that we all can laugh about afterwards! _________________ BIG GAP   Posted: Wed Nov 17, 2010 8:11 am walter Veteran Member Joined: 12 Nov 2010 Posts: 181 Location: towson md. i also like the looks of a big can at the end of the barrel! looks great! enjoy it. _________________ modified 1377c. first gen. Beeman hw97k. 177.cal. 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