Alot of people wanted to see this guide stickied so I created this duplicate post on the browning forum. Thanks for the support guys!
This gun is a BROWNING BPS MICRO 20GA.
I am not a gunsmith, don't try this unless you are willing to face the consequences of your actions.
You can click any of the pictures below to get a larger version (except the first one, its blurry).
If there is a particular step I might have breezed over, let me know. I can always whip it out and take better pictures.
Start by removing pin 1 (Trigger Guard Pin), do not remove pin 2(Carrier Pin) until you remove the trigger assembly and other parts and only if you want to remove the carrier.
This is a picture of the trigger assembly and cartridge stops that can be removed after the Trigger Guard pin is taken out.
The bolt, slide, and forearm below the red line can also be removed after Trigger Guard pin is out, and the Carrier and Carrier pin retainer above the line can be removed after carrier pin is out. Be careful not to lose the Carrier pin retainer as it is quite small.
This is a picture of all of the parts inside the gun. (Thanks Rastoff!)
3= Cartridge Stop Left
4= Cartridge Stop Right
5= Trigger Assembly
7= Slide Lock Release
9= Carrier Pin
10= Trigger Guard Pin
11= Carrier Pin Retainer
14= Hammer Pin
Beginning reassembly. Align the Carrier holes with the Carrier pin and push the pin in slightly to hold it in place. Don't put the pin all the way in yet.
I used a needle nose to align the Carrier Retainer with the pin holes and tapped the pin the rest of the way in.
Replace the forearm and pull it all the way back. Drop the bolt between the slide rails with the pin facing the proper direction.
Drop the slide into the gun and make sure the notches on the slide fit into the slide rail.
At this point its a good idea to move the forearm all the way forward. I didn't in the picture by mistake and sliding it forward before putting the trigger assembly back on caused the cartridge stops fall apart on me.
Three things to take note of. #1 points to the hammer pin that will rotate when replacing the trigger assembly, make sure you didn't accidentally flip it over or its a pain in the arse to put the assembly back on. #2 is the pin that attaches the slide lock release, it is able to free slide and will get in your way if it isn't perfectly centered. You can eyeball it and move with your fingers. The release IS removable and will probably fall off when you first remove the trigger assembly. It takes balance to keep the release attached to the assembly when replacing it.
This always takes me a bit to get on right, takes artful wedging and sliding. Once I successfully get the trigger assembly back on, it goes in so smoothly that I feel like its taunting me for struggling with it a few seconds before hand.
Well that was fun. Hope it helps!