Post WWII Commercially Manufactured M1 Carbines
	ERMA-Werke Dachau, Bavaria	.22 long rifle .22 Winchester Magnum Rimfire

Step 1: Replacing the Magazine Catch & Safety

Insert the safety into the right side of the trigger housing. Note the orientation of the safety in the picture. Insert the springs and their plungers into the trigger housing.
Here is where we see if you are reading this text, instead of just looking at the pictures. The concept is to force the plunger into the trigger housing while pushing in on the magazine catch. For illustration purposes, I used a screwdriver in the photo because my fat thumb would block what I'm trying to show. The plunger has a tendency to hang up on the entrance to the hole in the trigger housing. Using your fat thumb and index finger, orient the plunger as you push it into the hole. At the same time apply fairly strong pressure on the magazine catch with your other thumb.
You will not be able to force the plunger all the way into the trigger housing with your thumb. When the plunger is half way through the hole, you'll here a "click". Your thumb pressure on the magazine catch will have forced the magazine catch against the forward half of the plunger. Note the index finger position, which should actually be a little closer in case the plunger and spring pop back out. Keep the strong pressure on the magazine catch.
Using the small screwdriver, force the plunger back away from the magazine catch. When the plunger is out of the way, your thumb pressure on the magazine catch will snap the magazine catch into place.

Step Two: Assemble the Trigger Housing Assembly

Throughout this step, try to hold the trigger housing in the upright position. Sparingly oil the pin holes to assist reassembly and all surfaces that come in contact with the sear.
Make sure the small trigger bar pin is inserted to hold the trigger and trigger bar together. Insert the trigger spring into the notch in the bottom of the trigger. The fit should be tight enough to hold the spring in place. If it isn't, insert the spring into the round notch down inside the trigger housing.
Insert the trigger and trigger bar into the trigger housing. There is a groove towards the rear interior of the trigger housing (look back two pics) the sides of the trigger slide down into guiding the trigger slightly forward.
Pull down on the trigger to align the holes in the trigger and trigger housing, insert the trigger pin
Lift the trigger bar. Insert the trigger bar spring and plunger into the trigger housing
Lower the trigger bar onto the trigger. Insert the sear plate spring.
Place a pin tip of oil on each underside of the four flanges of the sear plate. Insert the sear plate into the notches that allow it to be placed into the trigger housing.
Push down on the trigger bar and forward on the sear plate. Align the top of the trigger bar to fit in the notch in the sear plate. With the safety off, pull back on the trigger, which will move the sear plate forward. Insert the sear plate pin. The pin should block the sear plate from moving towards the dismount notches.
Insert the sear spring and sear spring plunger into their notch in the trigger housing
Place a pin tip of oil on the edge where the sear tip rests on the sear plate. Insert the sear into the trigger housing. Align the hole in the sear with the hole in the trigger housing, insert the sear pin.
Pull the trigger and push the sear under the sear plate. Release the trigger.

If the sear and sear plate do not function properly it is a serious safety hazard, so make sure they're working properly before proceeding any further.

Step Three: Assemble the Receiver Assembly

Rub a small amount of oil on the firing pin and outer part of the firing pin spring. Reassemble the bolt by inserting the firing pin into the bolt. Insert the spring over the guide and both into the firing pin. DO NOT place the bolt assembly into the upper receiver at this point. Just note where it fits in the upper receiver.

Step Four: Assemble the Receiver to the Trigger Housing Assembly

Sparingly oil the pin holes to assist reassembly.

Fit the sear release to the right side of the lower receiver. Fit the ejector to the left side of the lower receiver. Hold them in place.

Slide the bolt on over the ejector. (If the ejector falls out it can simply be reinserted from the side at this point.) Note the firing pin, spring and guide almost in place.
Make sure the orientation of the spring guide is correct and push it in until the rear of the guide can engage the notch in the lower receiver, as shown.
Place a small amount of oil in the upper/lower 'T' channels of the slide. Place the operating slide into the upper receiver. Tip the upper receiver slightly forward and make sure the end of the charging handle/slide goes under the barrel. Then, carefully place the upper receiver over the lower receiver, watch the pin and bolt holes for proper alignment.
As the upper receiver seats onto the lower receiver, line up the tab on the charging handle/slide with the slot in the top of the bolt.
Tap the pin at the rear of the receiver in place
Replace the large screw into the left side of the receiver. Tap the pin to the right back in place.
Turn the receiver and barrel assembly upside down, slide the guide rod through the front of the slide and onto the spring until the guide rod its into the hole at the back of the slide and is flush with the front of the slide.

Step Five: Replace the Stock and Handguard

Place the receiver and barrel down into the stock. Reinstall the screw behind the trigger guard. Put the handguard in place, then slide the barrel band over the front of the stock and handguard snugly. Replace the screw in the barrel band.