Enjoyed the challenge of the scramble to the top! I used an alternate route to the very top. I walked on forest paths past ruined house and continued until below and East of the top. At this place there is a steep (and maybe newish) path up to a nice rocky viewpoint. (Just before another mountainbike trail down). Very steep but nice to come up to this point for the view.

Now the fun starts if you want to find the trig pillar! Compass/GPS essential. Gloves and protective clothes highly recommended. Carry on East, not steep now, 10 mins scramble under gorse and pine. Getting down low and crawling worked well. Lots of the gorse was old so one could break through it. Does not look like there is any other path in or out at trig pillar. Good fun!

A viewranger route to show this route:
http://my.viewranger.com/route/details/MTQ1NzU5Mg%3D%3D

Forest track 30min from coilte car park entrance..
Steep mountainbike track up 10 min to rocky viewpoint.
Very dense scramble through thick pine and gorse to Barrinsky top trig pillar, 10min. Warning! Very dense! Scrambling along animal tracks on prickly gorse and pine. Bring jeans, gloves. Torn shirt!
20min + 20min down again by smaller steeper paths at end.

Lovely forest tracks through mix of old established trees and newer tree plantation. Steeper up top some heathery cliffs. Good views of countryside around from the forest tracks. No view frim the trig point though!

Met a few mountainbikers. One said there were some mountainbike paths before but they had been removed (by the tree felling I think). They were fixing up the paths again.

Very quiet when we got there but a few cars appeared Sun evening. Linkback: https://mountainviews.ie/summit/972/comment/19675/