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Posted: 11/18/2004 7:37:49 AM EDT
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As you know, ATF has strongly discouraged the use of unmodified FA M16 parts in AR-15 rifles. I was just reading my copy of the ATFE book this morning. *I know it isn't law, I know it's stupid, take those comments elsewhere* However, there are a fair number of nice Colt FA LPK out there. I know that the major difference between the FA hammer and semi hammer is the "tail." Colt LPK do have the best QC. Any information on what needs to be changed out? An online photo-guide "dremel here" - ? Thank you. |
Could you post a link to that page? I spent some time looking and doing searches on "ATF," "Fire control" and "hammer" and just couldn't find it. Thanks - BT Edit: found it here on arf.com! http://www.ar15.com/content/legal/AR15-M16Parts/ |
Thanks - I found the information I needed. You actually misunderstood me; I was interested in purchasing FA parts and modifying them to SEMI-ONLY configuration, a matter of removing metal with the dremel. No receiver mods, no FA. ATF doesn't care if you do this if you mod 'em to SEMI configuration - and the Colt parts are sweet and nicely made. Thanks all |
Not really. Colt LPK are superior in terms of QC; if one hammer tests bad, the entire lot is trashed. I know a Colt Armorer and dealer locally who has had to send back ArmaLite LPK as being out of spec; we spent a good morning looking at internals. (He does like ArmaLite though, and I'm tempted by RRA since they won the DEA contract). I know that Tweak (another Colt armorer as well as having .mil and Oly experience) only likes Colt LPK as well. Too many bad stories about the DPMS units that cost $45 but crack, etc. Of course, there's probably nothing wrong with most LPK...but if you are buying A, B, RRA LPK for $55, and I can buy a Colt FA kit for $40 and dremel it, who's wasting $? I can spent that extra $15 on beer. ;) |
Yep. And there isn't any modifying the selector. You just have to get a semi one. Disconnector would have to get the tail cut off, and the hammer would need the rear channel welded closed. MUCH too much of a pain in the ass. Just get yourself a semi FCG, and be done with it. Hell, I've even been satisfied with my DPMS kits from Brownells. They work 100%. |
I would just like to know where to get these Colt FCG parts for $40. I don't intend to modify them to semi. I have a registered receiver full auto and would like to replace the FCG parts with new ones. Thanks. |
 No grinding to be done. Lots of filling/welding/shaping. What's the point? |
I also get the C&R disc. at Brownells, but anecdotally DPMS is hit and miss with the LPK. Glad you had good fortune. With a semi-only bolt carrier, the tail cut off the trigger and disconnector, and a semi-only selector, why bother to modify the trigger? Not required. |
I don't know about "not required." It may not be. However, I feel the need to cover my sweet virgin ass when it comes to the BATFE  Not that you should have any issues with them inspecting the rifle, but remember. If you do, and if they CAN MAKE IT FIRE more than one round with a single pull of the trigger (malfunctions included), it's a machinegun.
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The text of the section referring to AR-15s and M16 lower parts says "more than one round" but you can read it here - it's a big text page, do a control-F for "Important Information Concerning AR-15 type rifles" : http://www.atf.treas.gov/pub/fire-explo_pub/geninfo.htm |
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Yes, the law only relates to no more then 1 round per trigger pull or some language that means no full auto... The reason for concern over the selector and disconector has to do with the fact that these two items without a GI sear will give you an untimed slam fire condition that MIGHT give you a 2-rd burst and the BATFE only needs to see it happen once! As for the selector, as long as you remove the tail on the disconnect, I personally don't feel that an M-16 selector is a big deal (Note, this is an oppinion and not legal advise). I say this as with an M-16 selector and all AR-15 parts you will only end up with a rifle with a SAFE/SEMI/SEMI series of selector positions. Nowhere is there a regulation (except WA state that prohibits ANY Machinegun parts and perhaps other states as well?) that says I can not have a selector that allows more then one SEMI position! My AR-15 with the select fire kit for the LL works this same way so when the link is not in the lower I get SAFE/SEMI/SEMI: quarterbore.com/forum/viewtopic.php?p=97#97 Note, these were also M-16 parts but there is no way that you could get full auto with these parts (without the LL) due to the way they work! Note the way I bobbed my hammer in the pics to make it non-full auto! Personally, I would just buy a semiauto parts kit from Colt, Bushmaster, DPMS, RRA or who ever and use them. Just the same, there is no reason that you can't do what you describe... Just remove the spur from the hammer, remove the tail on disconnect, and consider replacing the selector. |
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