fivonut
03-28-2010, 07:24 PM
I wanted an AR-22 and was looking at the Colt M4-22's when the Plum Crazy lowers came available. I picked one up from Brian and started searching for a dedicated 22 upper. One of my criteria was that the upper have an aluminum receiver. I didn't like the feel of the S&W M&P 15-22 full composite setup. I settled on a Tactical Solution LT dedicated upper. Pics below!!
http://webpages.charter.net/fivonut/Plum_Crazy/DSC00696.JPG
http://webpages.charter.net/fivonut/Plum_Crazy/DSC00697.JPG
http://webpages.charter.net/fivonut/Plum_Crazy/DSC00698.JPG
and the assembled rifle
http://webpages.charter.net/fivonut/Plum_Crazy/DSC00703.JPG
I had some cycling problems at the range. It would fire and cycle a round but was not resetting the hammer. I thought maybe the spring weight of the hammer was too heavy so I worked on it a little bit to lighten it up and that didn't help. I actually lightened it to much and was not firing a round. I put the Tac Sol upper on my M&P15 lower and it ran fine, 100 rounds no problems, cycled perfectly. I met up with Brian to pick up a few things and we looked over the Plum Crazy lower and discovered scrape marks on the sides of the hammer. It appears the hammer is too wide and is slowing down the 22 action enough that it wont reset it. I'm going to see if taking a few thousandths off each side makes a difference. I'm 99.9% certain this should solve the problem. here's pix of the hammer.
http://webpages.charter.net/fivonut/Plum_Crazy/DSC00699.JPG
http://webpages.charter.net/fivonut/Plum_Crazy/DSC00700.JPG
http://webpages.charter.net/fivonut/Plum_Crazy/DSC00702.JPG
I'll report back when after I run a few rounds through it.
http://webpages.charter.net/fivonut/Plum_Crazy/DSC00696.JPG
http://webpages.charter.net/fivonut/Plum_Crazy/DSC00697.JPG
http://webpages.charter.net/fivonut/Plum_Crazy/DSC00698.JPG
and the assembled rifle
http://webpages.charter.net/fivonut/Plum_Crazy/DSC00703.JPG
I had some cycling problems at the range. It would fire and cycle a round but was not resetting the hammer. I thought maybe the spring weight of the hammer was too heavy so I worked on it a little bit to lighten it up and that didn't help. I actually lightened it to much and was not firing a round. I put the Tac Sol upper on my M&P15 lower and it ran fine, 100 rounds no problems, cycled perfectly. I met up with Brian to pick up a few things and we looked over the Plum Crazy lower and discovered scrape marks on the sides of the hammer. It appears the hammer is too wide and is slowing down the 22 action enough that it wont reset it. I'm going to see if taking a few thousandths off each side makes a difference. I'm 99.9% certain this should solve the problem. here's pix of the hammer.
http://webpages.charter.net/fivonut/Plum_Crazy/DSC00699.JPG
http://webpages.charter.net/fivonut/Plum_Crazy/DSC00700.JPG
http://webpages.charter.net/fivonut/Plum_Crazy/DSC00702.JPG
I'll report back when after I run a few rounds through it.