I am looking for information on the tactics, size, technology available to, and the TO&E of the Beijing Military Region Special Forces Unit - code named "Arrow".
You ask difficult questions and I don't have a specific answer to them. I also do not want to cause unintentional offence to people who have not done the requisite wider background research to provide a context - besides the fact that I am not tracking the development of PLA's special forces.
However, I will tell you that your information is slightly out of date - the PLA is no longer using the concept of Military Regions. Last month, the PLA announced the restructuring of its seven geographically-based Military Regions (or 大军区, aka "dajun qu"), into Battle Zones (or 战区, aka "zhan qu"). These four or more "zhan qu" allow the PLA to react to a more diverse range of security threats and better project its forces and are broadly modeled after
unified combatant commands (with a link to a flawed discussion on the topic) of the US Department of Defense.
Further, much of PLA's so called "special forces" are not resourced or structured like US (eg. US SOCOM) or UK SAS and SBS. More often than not, press reports fail to distinguish between PLA "special forces" who are elite troops with niche raid or direct action capabilities (i.e. look the part, with interesting personal gear) and real PLA special forces, who are in contact with special forces in the region. Even then and despite similarity in load-outs and personal weapons, PLA special forces are also without the same training budget for currency training in the range of missions (be it green side or black ops) or supplied with dedicated enablers (like 160th SOAR), when compared to US Tier-One forces.
More than just taking part in special forces competitions (in which Chinese SF teams have taken part and won), silent professionals also talk about military-to-military relationships (including foreign language skills), logistics, ISR and command and control (C2). This would include reading up on the US concept of F3EAD or find, fix, finish, exploit, analyze, and disseminate. The PLA's raise, train and sustain cycle also needs to be stated, studied and analysed before meaningful discussions can be made. Certainly, the PLA's capability has grown by leaps and bounds over the years and they now have enablers to project power abroad. The PLAN have amphibious task groups with a demonstrated capability to project power abroad - most recently in April 2015 in Yemen, where they conducted non-combatant evacuation of 600 citizens and 225 foreign nationals, smoothly. Now that the PLAN have an opertational carrier, their ability to project power will continue to grow even more rapidly.
PLA special forces have also taken part in ADMM Plus special forces exercises, the most recent of which was hosted in Indonesia (with US support) in 2013 or so. Australia and Singapore are the current co-chairs of the expert working group on counter-terrorism and it is under these ADMM Plus expert working group auspices that the PLA special forces attend regional conferences on this subject matter. And ADMM Plus was created to support inclusive military-to-military cooperation (on a range of areas/topics) between ASEAN and plus 8 countries (which includes China, US and Australia to name a few).
At President Xi’s speech at the "
Commemoration of 70th Anniversary of War Victory” (see translated link provided) on 3 September 2015, he announced that China will cut the number of its troops by 300,000. This restructure will enable PLA to become more professional over time, as more resources are allocated to new equipment acquisition and training.
I am of the view that you can't understand the PLA without understanding the PLA's revolutionary spirit, or what they call 井冈山 精神(jinggangshan jingshen) - is likewise shaped by a history deeply rooted in strategies to liberate its own masses from "internal contradictions" and foreign occupiers. You might want to do better research on the basics, and share them over a period of a few months (see this closed
2013 forum thread which deals with some queries on special forces in Southeast Asia), before asking more questions (aka contribute to the forum)?
You can start with this September 2015 article on the PLA by
Michael S. Chase. Good luck with your research and I hope that these pointers will help.