AR15 Recce Build - P2 - Lower


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Sylvan-Forge
April 6, 2008, 06:35 PM
Carrying on from Part 1 - Upper http://www.thehighroad.org/showthread.php?t=342390



Lewis Machine & Tool Company, Inc. (LMT)
Defender lower with SOPMOD stock (model L7LB2)
http://www.thehighroad.org/attachment.php?attachmentid=75915&d=1207519643


Chip McCormick Corp (CMC)
Super Match Trigger Group (model 91501)
http://www.thehighroad.org/attachment.php?attachmentid=75920&d=1207520098


TangoDown BattleGrip
http://www.thehighroad.org/attachment.php?attachmentid=75921&d=1207520304


Magpul Enhanced trigger guard
http://www.thehighroad.org/attachment.php?attachmentid=75922&d=1207521160



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Sylvan-Forge
April 6, 2008, 06:36 PM
The CMC trigger group dropped right in, no probs..
the safety/selector needed to be removed first..
http://www.thehighroad.org/attachment.php?attachmentid=75923&d=1207521753


Installed the provided pins (tight fit!) from the right with a plastic faced hammer..
http://www.thehighroad.org/attachment.php?attachmentid=75924&d=1207521967


To protect the receiver from scratches, I placed a piece of paper with small holes cut for the pins to protrude through and pushed the provided c-clips on using the edge of the plastic hammer head..
http://www.thehighroad.org/attachment.php?attachmentid=75925&d=1207522297


Using a small piece of 3/4" x 3/4" wood to support the fragile "ears", I drove the original roll pin that secured the trigger guard out using a Brownells roll-pin starter punch..Installation of the magpul trigger guard went smoothly, though the fit was tight..
Note the provided hex screw (on the right), screwed in until flush..
To touch up around the roll pin hole, I used a Birchwood Casey Super Black touch up pen..
http://www.thehighroad.org/attachment.php?attachmentid=75926&d=1207523110





Insert Brownells hammer drop block, pull trigger,
and :D



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Sylvan-Forge
April 6, 2008, 08:05 PM
SOPMOD stock..
http://www.thehighroad.org/attachment.php?attachmentid=75932&d=1207526443


Storage tubes removed..
http://www.thehighroad.org/attachment.php?attachmentid=75933&d=1207526494



~LOP (length of pull) measured from center of trigger to include rubber stock pad (1/2" thick):

Position 1 : (fully collapsed) : 11-1/4"
Position 2 : 11-7/8"
Position 3 : 12-1/2"
Position 4 : 13-1/8"
Position 5 : 13-3/4"
Position 6 : (fully extended) 14-3/8"


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Sylvan-Forge
April 14, 2008, 05:41 AM
Test and prep before first live-fire:


http://www.thehighroad.org/attachment.php?attachmentid=76448&d=1208163295
Brownells hammer block shown during CMC trigger test.

Safety test:
Hammer uncocked, safety should not rotate to SAFE position.
Hammer cocked, safety should be able to rotate from FIRE to SAFE and vice versa.
Safety on, give a good squeeze to the trigger .. hammer should not fall.

With safety off, squeeze trigger and keep it held back (if no hammer block, hold the hammer to keep it from striking the receiver or bolt catch) .. re-cock the hammer .. it should be caught by the disconnector .. slowly release the trigger .. the hammer should be handed off to the trigger.
Repeat a couple times and a couple more while pulling upward on the hammer.

Rotate to SAFE, the hammer must not fall.


http://www.thehighroad.org/attachment.php?attachmentid=76449&d=1208163315
Inspecting the trigger group for proper lubrication.


http://www.thehighroad.org/attachment.php?attachmentid=76450&d=1208163334
Removing the buffer assembly.


http://www.thehighroad.org/attachment.php?attachmentid=76451&d=1208163360
The safety should have been on during removal .. all good though.
Receiver extension (buffer tube) is filthy inside and no lube found.
Maybe it's dry lubed? I don't know, so out comes the cleaning stuff ..


http://www.thehighroad.org/attachment.php?attachmentid=76452&d=1208163382
Dewey chamber rod with 8-32 female threads.


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Sylvan-Forge
April 14, 2008, 05:49 AM
http://www.thehighroad.org/attachment.php?attachmentid=76453&d=1208166184
8-32 to 5/16-27 adapter (brownells 234-000-056) and AR-15 receiver mop.


http://www.thehighroad.org/attachment.php?attachmentid=76454&d=1208166231
Into the extension it goes along with some aluminum safe cleaner.
Nasty!
A couple follow ups with dry towels.


http://www.thehighroad.org/attachment.php?attachmentid=76455&d=1208166266
Some ATF on paper towel goes in to nullify any remaining cleaner (esp. around the ext. threads) and to provide lube.
Hopefully this will improve the life of the extension/tube, not to mention the spring and buffer.


http://www.thehighroad.org/attachment.php?attachmentid=76456&d=1208166289
Keeping the receiver tilted to try and keep any excess ATF out of the lower reccesses and trigger group.


http://www.thehighroad.org/attachment.php?attachmentid=76457&d=1208166310
Removing excess lube from underneath the takedown pin.


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Sylvan-Forge
April 14, 2008, 06:15 AM
Buffer assembly reinstalled and ready to go.

Once the upper is prepped, it'll be time to hit the range..

:D

Sylvan-Forge
August 28, 2008, 02:09 AM
After trying the SOPMOD stock, I wasn't comfortable with it, so I'm gonna try something different .. anyhoo, here's how I dealt with..

Buffer Tube Removal:

The LMT lower assembly came with the buffer-plate staked in two places:
http://www.thehighroad.org/attachment.php?attachmentid=83764&d=1219902366

Craftsman 3/8 x 4.5" center-punch to drive back the stakings:
http://www.thehighroad.org/attachment.php?attachmentid=83765&d=1219902393

HammerTime: HammerDance not shown for your own well-being :p
http://www.thehighroad.org/attachment.php?attachmentid=83766&d=1219902422

DPMS multi-tool: Note the projection near my pinky .. it indexes to the notch(s) on the buffer-tube nut:
http://www.thehighroad.org/attachment.php?attachmentid=83767&d=1219902451


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Sylvan-Forge
August 28, 2008, 02:10 AM
Once the stakings are dealt with, loosening the nut is fairly easy:
http://www.thehighroad.org/attachment.php?attachmentid=83768&d=1219904062

Restraining the buffer-plate while loosening the nut so as not to launch the takedown-pin spring:
http://www.thehighroad.org/attachment.php?attachmentid=83769&d=1219904082

Moved the buffer-plate out of the way to get the spring out:
http://www.thehighroad.org/attachment.php?attachmentid=83770&d=1219904106

Takedown-pin slides right out:
http://www.thehighroad.org/attachment.php?attachmentid=83771&d=1219904132

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Sylvan-Forge
August 28, 2008, 02:12 AM
Keeping the buffer-retainer from launching while unscrewing the buffer-tube:
http://www.thehighroad.org/attachment.php?attachmentid=83772&d=1219904223

Note the projection on the buffer-tube .. it retains the buffer-retainer:
http://www.thehighroad.org/attachment.php?attachmentid=83773&d=1219904246

Receiver off the block and dumping the takedown-pin detent:
http://www.thehighroad.org/attachment.php?attachmentid=83774&d=1219904269

All the bits:
http://www.thehighroad.org/attachment.php?attachmentid=83775&d=1219904298

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Installation - go in reverse, just make sure the buffer-tube is the correct type (mil or commercial), the right length and properly retains the buffer-retainer when test fitted :)
I'll try and get a good shot of it when I install the new buttstock assembly

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Sylvan-Forge
August 28, 2008, 03:06 AM
Safety Remove/Replace coming soon ..

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Kino74
August 28, 2008, 03:07 AM
Looking nice :)

Sylvan-Forge
August 28, 2008, 03:09 AM
Thanks :D

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Bartholomew Roberts
August 28, 2008, 07:57 AM
Thanks for a great post, Sylvan-Forge!

Dave Markowitz
August 28, 2008, 08:16 AM
Outstanding post!

Sylvan-Forge
August 29, 2008, 01:25 AM
Thank you gentlemen!
:D


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As promised, here's Safety Removal:

First, empty any grip contents:
http://www.thehighroad.org/attachment.php?attachmentid=83814&d=1219986919

Grip bolt shown:
http://www.thehighroad.org/attachment.php?attachmentid=83815&d=1219986942

Was pretty tight, so I put my allen-key into some locking pliers:
http://www.thehighroad.org/attachment.php?attachmentid=83816&d=1219986963

Removed bolt and carefully walked the grip off, taking care not to kink the safety spring:
http://www.thehighroad.org/attachment.php?attachmentid=83817&d=1219986982

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Sylvan-Forge
August 29, 2008, 01:26 AM
Once the grip is off and safety spring is out, everything wants to fall apart .. don't lose your safety detent. Note the pointed end .. the point rides the safety's axle:
http://www.thehighroad.org/attachment.php?attachmentid=83818&d=1219987830

Push out the safety (if it hasn't fallen out already):
http://www.thehighroad.org/attachment.php?attachmentid=83819&d=1219987856

All the bits:
http://www.thehighroad.org/attachment.php?attachmentid=83820&d=1219987878

Installation reverse of removal: Safety, Detent (dab of grease then pointy end 1st), spring into grip, walk grip on (no kink spring) and tighten it down, test safety (see post #4 above).

Note: I guess I should have done this with the hammer lowered :)

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Deus Machina
August 29, 2008, 08:23 AM
First, empty any grip contents:

:D
Hehe.

Shung
August 29, 2008, 08:26 AM
love that stock.. I whish I could get one !

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