You are referring to the chamber brush that was included with 742 rifles when purchased new. The Remington Model 742 is no longer available and was replaced with the Model 7400, Model 4 and the Model 74. These rifles have the same outward configuration as the Model 742, with slight internal changes to the bolt locking lugs. You may be able to get a chamber brush directly from Remington for the Model 742. If they no longer offer that Model specific (742) brush, those for the 7400, 4 and 74 will work. The Model 7400, etc. has recently been replaced by the Model 750 which is very similar to all the above semi-auto rifles with an upgrade involving the gas-system. You need to specify which caliber you have. Cost will be around $10.00 plus shipping.
Almost impossible to say without having the gun in hand. The two most likely reasons are that parts are dirty, or parts are worn/broken. I would start with a thorough cleaning, with special attention to the chamber, bolt, and extractor/ejector. If that does not cure the problem. look for wear or breakage of the extractor/ejector.
.22 WRF or .22 Remington Special
In regards to a Remington rifle, SPS stands for Special Purpose Synthetic.
Any commercial 38 special ammo can be used in a firearm marked 38 special caliber. (Remington,Federal,CCI,Fiocchi,etc.) The Colt serial number guide that I found on the internet says Colt Detective Specials with an "M"after the serial number started with the year 1975. The gun should have a shrouded extractor rod.
Look at the date code or call Remington, see related links
No, you have to buy a special cleaning system for the player.
The Remington 22 special (used in model 12, 121, etc) is the same as a 22 WRF Occasionally Winchester or CCI will make a run of ammo but Remington doesn't anymore. Your have to search gun shows if you want to find some.
priceless
No, one does not need to use special cleaning techniques to clean a marble floor. Cleaning a marble floor can be done just like cleaning every other type of floor.
Not unless it was special ordered or has a history
First some background info on the Model 81 Made from 1936 to 1950 , @ 55,581 produced. aw several asking prices for the model It was offered in the follwing grades: 81A Standard 81C Special (changed to 81B) 81D Peerless 81E Expert 81F Premier Yours could be worth 175 to 1000 depending on grade.
100-400 USD