Holy fuckin' hell. My dad decided to take apart his 70's wingmaster. It's only about a $200 gun due to the condition. On the other hand, it has future sentimental value to me. Problem is, he's disassembled it and I can't get it back together.  Anyone else ever had this problem?

What?

Is it the slide? Bolt?

In going to guess he took the actuon apart.  If you depress the loading gate you will feel two tabs along the wall of the reciever . They have to be depressed as you slide the "forks" or arms of the pump in.  The bolt has to be sitting in the "tray" on the forks.  Only will fit one way.  Start the tips of the forks into the reciever and then reach under and depress them one at a time. Then it will slide in.  If you still have trouble Youtube is your friend.  In all the 870 only has about 7 parts if you knock the pins out and take the trigger guard out.   Hammer also has to be back on the group to go in 

Dupe

http://www.ar15.com/forums/t_1_5/1945513_Wingmaster-870-question-.html

Wingman Tee is the Chinese made knock off version of the Remington Wingmaster. Unfortunately they were designed to not be disassembled.  Toss it in the garbage.