The CMMG AR-15 .22 Long Rifle conversion kit is a great
product for people looking to save some money on
ammunition by converting their AR-15 from .223/5.56 to
22 Long Rifle.
Installation and care of this kit is extremely easy, and we'll be covering just that in this
video.
We will be installing the Echo version of the CMMG .22
conversion kit, but the installation is the same for the
Alpha and Bravo units as well.
To install the conversion kit, first make sure the gun is
unloaded by visually and physically inspecting the
chamber.
Once we're sure the chamber is clear and all ammunition has been removed from the workplace,
we can begin.
The first thing we need to do is push out the takedown pin
to split the upper and lower receiver.
Then pull the charging handle rearward halfway, and remove
the existing bolt and carrier group.
The Echo kit comes with an anti-jam charging handle,
which we will be installing, but the kit can be used with
your existing charging handle.
With that being said, We can go ahead and completely
remove the charging handle by pulling it down and out of
the upper receiver and set it aside.
Next, we'll insert the CMMG anti-jam charging handle into the rear
of the upper receiver, inserting it halfway until it falls
into place and can be pulled upward.
We'll then slide the .22 bolt carrier group into the upper and push it and the charging
handle fully forward into place.
All that's left is to close the lower and push in the
takedown pin and installation is complete.
Cycle the action a few times and verify the safety is functioning
correctly, and you're ready to start shooting.
With installation now covered, next we'll quickly go over
proper maintenance of the conversion.
To clean the conversion kit, you'll first want to remove
the bolt carrier group from the upper receiver, pushing out
the takedown pin to gain access to the bolt carrier group.
Then Pull the charging handle out halfway, and remove the
carrier.
While you're here you'll also want to go about cleaning the
barrel and chamber just as you normally would clean your
AR-15, for detailed instructions on how to do this, click the
video link below or visit brownells.com.
With the bolt carrier now removed we can now begin to
disassemble it.
The Echo kit comes with a forward assist, which we'll remove by pulling it out of the
right side of the carrier.
If you're working with the Alpha or Bravo kits, you
can skip this step.
Next, we'll remove the chamber adapter by flipping the
carrier over and pulling back on the bolt to compress the
spring and guide rod; then we'll pull out slightly on the thin
guide rail on the left side of the carrier and the chamber
adapter will pop out.
Then Slowly release the pressure on the bolt and remove it
towards the front of the carrier, followed by the spring
and guide rod.
Lastly, we'll remove the firing pin and the extractor from
the bolt.
The extractor pin is located on the top right side
of the bolt, and we'll use a punch to push it out towards
the bottom.
Then the extractor can be easily removed.
To remove the firing pin retaining pin, begin by locating it
on the left side of the bolt, then simply grab the rounded
edge of the pin with a pair of pliers, depress the firing pin
and pull the retaining pin out.
You can then pull the firing pin out of the bolt towards the rear.
With everything now disassembled, we're ready to clean.
To get started, Scrub the entire conversion unit with a
nylon brush and solvent.
Look for heavy buildup at the front of the unit where it seats in the centerfire
chamber.
Also pay special attention to the bolt face and chamber
mouth.
Clean these areas well and remove any carbon buildup that may interfere with proper functioning
of the kit.
Now spray all the parts out with an aerosol cleaner
and wipe off any excess.
With everything now clean, Next we'll want to lubricate
the bolt and carrier to assure proper function of the unit.
Apply a quality gun oil like Break Free to the outside of the
bolt, where it rides in the carrier and to the guide rails it
rides on.
A drop or two on the guide rod and spring will
also help to keep the kit functioning properly.
Finally, add a little oil to the charging handle where
it rides in the receiver and call it good.
Before re-installation, we'll need to reassemble the kit,
starting with the bolt.
We'll first insert the firing pin, spring end first, into the rear of the bolt.
We want to be sure that the cutout for the retaining pin is facing
upwards.
Next, depress the firing pin and insert the retaining
pin, open end first into its hole on the bolt, making
sure that the closed end of the pin is pressed flush with
the bolt.
Now, we'll insert the extractor into the side of the bolt.
Align the hole in the extractor with the hole in the bolt and
insert the extractor retaining pin from the bottom.
Once you get it started, use your punch to get
it into place.
With the bolt reassembled, we'll now insert the spring and
guide rod back into the carrier by lining up the pin on the
backside of the guide rod with the circular hole on the
carrier.
Next, insert the spring into the back of the bolt and
slide the bolt onto the carrier by aligning the cutouts in the
bolt with the carrier guide rails.
Pull the bolt to the rear of the carrier, and then flip the
carrier over to insert the chamber adapter.
The feed ramp on the adapter should be facing the bottom
of the bolt.
Align the grooves on the right side of the adapter with the
thicker guide rail and then spin the adapter counter
clockwise until the thin guide rail snaps into the left side of
the adapter.
Now, all that's left is to flip the carrier back over, and slide
the forward assist back in from the right side, with the
open end facing forward, until it snaps into place.
With the bolt carrier now reassembled Place it back into
the upper receiver and slide it and the charging handle
forward into place.
Close the receivers and push in the rear takedown pin and the gun is fully reassembled.
Again, cycle the action a few times and verify the safety is
functioning properly and the job is done.
Thanks for watching, and be sure to visit brownells.com
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