.AR15 wobble, AR!5 upper lower receivers, 
Installation Basics

 For Rifles And Stripped Receivers.
.How to Tightens Loose AR15 upper lower receivers 


When the receivers are closed the 
shim c
urve is above the opening 
in the lower receiver. The legs
of the shim do the work.

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Installation/Fitting Requires 
 Gunsmithing Skills.
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  Some Colt upper receivers do not have 
  a machined relief. Check recess/sear 
relief for .090" depth. Recess
 width: .750" - .755". 

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 Gauge Receiver Play by laying a 
 .012" automotive feeler gauge across 
  lower receiver above the safety lever. 
Close and hold the receivers together
 firmly. If the pin resists when pushed 
or meets resistance passing through
the receivers means the shim should
 work. If the pin passed through the 
 receivers without resistance means
 the shim may not work.
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 Place one side of the shim against the 
recess wall, push the opposite 
side down into recess.

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Shim is fully seated, surface level 
 and parallel with upper receiver. 
Angled ends are for removing
 the shim with a screwdriver.
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Close and hold the receivers together 
firmly, check takedown pin travel. 
The upper receiver lug bore should 
appear slightly higher than the
 bore in the lower receiver.

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Remove the shim from the upper 
receiver. Note front, middle
and 
curve thickness.
Remove backing
 from the Shim Gripper Block. 
Place the longer side of the 
shim against
 the
adhesive.
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.
 Place gripper block on sanding strip.
Remove
.001 inch from the shim. 
Lightly sand
outer edge around 
the shorter side of the shim.
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.

 Install shim, hold the receivers together 
firmly, check pin travel. If necessary 
remove the shim and surface again.
 Progress Slowly, Do Not Force
 
  The Takedown Pin.   
 The slot in an uninstalled takedown
 
 
pin must align with the spring and 
 detent bore in the lower receiver.
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  .

 
The shim is surfaced gradually until 
  the takedown pin pushes smoothly 
 through the
 upper receiver lug
  bore and enters well into the lower
 
 receiver bore as shown above.

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The remaining short portion of the 
takedown pin can be seated with 
the supplied driver. Tap driver
 with a screwdriver handle.
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Takedown pin is fully seated and 
the receivers feel Rock Solid.

Follow Instructions Provided In The Kit.
.
.
National Match Shim
.
.
Feedback 
..
  Gun Store 9 Packs 
.
..
AR15AccuShim
. 
 
.
.Budget Builds.
.
Questions 
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 .e-mail: wheeldiamond@netzero.net