HK416 .22LR issue

[Jonno111]

Hi folks , I have been shooting this rifle for past 12 months without issue and used CCI Minimag. Too date approx 3000 rounds with no issue. Yesterday during a club shoot I tried a box of CCI Stingers and when stripping the gun after noticed the bumper on the lower was broken in two . May be a coincidence ? Anyone had a similar problem? Any idea where I can get a replacement in the UK? Part number 577.20.09.1.

[25Pdr]

Tried this one? They do not sell to the public though.

http://www.bisley-uk.com/product_v3.php?i=HK416S&c=607