I see lots of raw guys on my team ( won't name names, but a few guys totaling at or above 2000 raw) do front squats once in a great while.... but not for the purpose of stretching anything or hitting depth.
If you aren't hitting depth raw it's a form issue. No muscle is so tight that it won't let you hit depth, your singlet isn't too tight..... just form. Usually just bending over so far that your hips come up.
If you post a video I can say for sure.... but 90% of the time its either:
1) you're afraid of the weight, so you're cutting it high..... solution: man up.
2) You are sitting back to far and putting the weight in your back. Because I train in gear 99% of the time I do this when I squat heavy raw...... solution: unlike a geared competitor who wants to sit back in to the suit and load the hips/gear. A raw squatter wants to drop the hips straighter down. It's harder on your knees but easier on hips and it lets you drive with your quads and hit depth easy.
3) you are too wide ( feet) or are bent over and your belly/belt/chest is hitting your knees, but your ass is up in the air way above //..... solution: keep your head UP and your chest UP...
either way, good luck