which one to choose

[moger]

wanna get a scope for my umarex m4 rimfire rifle..but not sure which one to choose. been havin my eye on the leapers scopes..here are the ones i been looking at..http://www.opticsplanet.net/leapers-...-sunshade.html

http://www.opticsplanet.net/leapers-5th-gen-classic-bug-buster-ts-4x32-mil-dot-compact-rifle-scope-with-picatinny.html

http://www.opticsplanet.net/leapers-5th-gen-4x32-ts-platform-mini-rubber-armored-scope-with-mil-dot-scp-432mdl3r.html

also if i purchase any of these. will i need a riser mount to clear over my front iron sight? the last link looks like i wouldnt need to. but idk..im also open for suggestions.