1) Is an A3 receiver with removeable carry handle allowed in SR matches?
Yes (if you really mean A4). See CMP Rule 6.2.3 and NRA Rule 3.1.3
2) Did they go through w/ that 'no more standing to position' thing in RF strings?
Yes, but the purse fight between NRA and CMP continues unabated. See CMP Rule 8.1.5 and NRA Rule 10.1.7
3) Are current SR match rules online for viewing? If so, can someone provide a link to them?
CMP -
http://www.odcmp.com/Competitions/Rulebook.pdf
NRA -
http://www.nrahq.org/compete/RuleBoo.../hpr-index.pdf
Maury