Hi, I've just got myself an S400 MPR FT in .177. It is very nice but has a bit of a crack. The silver bit on the end looks like it does something, but seems not ?? Is it some sort of silencer ? If it is, it does not seem all that good? Does it have some affect. If I changed it to something like a Weihrauch silencer, would I lose accuracy or anything ? These seem very nice Air Stripper .177 Calibre. Natural Aluminium for MPR 14.0mm Barrel 2/5ths the way down http://rowanengineering.com/products1.htm What does an air stripper do over a silencer? Thanks, Rob.